<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2023 Workiva-->
<!--r:f9dd4dc9-e401-4f59-8c5b-166de3475002,g:fdf51ef8-5b36-489a-a1e0-8806dc5088ac-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.oxy.com/role/CoverPage" xlink:type="simple" xlink:href="oxy-20230630.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/CoverPage" xlink:type="extended" id="ia38ee898caec4a7e823589ea41457c3f_CoverPage">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_cea500b2-1b22-406b-96e8-c6851a7068f3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_DocumentType_cea500b2-1b22-406b-96e8-c6851a7068f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_0b85cfaf-23b7-40e1-867d-f820c9c322e3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_DocumentQuarterlyReport_0b85cfaf-23b7-40e1-867d-f820c9c322e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_9b98dc1e-7572-40cb-88c2-aa23d26efd25" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_DocumentPeriodEndDate_9b98dc1e-7572-40cb-88c2-aa23d26efd25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_5e6e6383-b433-4b67-b3d9-3d2e77091a77" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_DocumentTransitionReport_5e6e6383-b433-4b67-b3d9-3d2e77091a77" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_58c50564-4e2f-4fe3-8bdc-374b394e5f87" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityFileNumber_58c50564-4e2f-4fe3-8bdc-374b394e5f87" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_52b66b11-b716-4746-9f06-df7ed7702e75" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityRegistrantName_52b66b11-b716-4746-9f06-df7ed7702e75" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_429a6796-2c72-4e1d-9c60-5aa1445f7437" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityIncorporationStateCountryCode_429a6796-2c72-4e1d-9c60-5aa1445f7437" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_7a49ef99-7227-4b8e-b9e7-70e3f9ca29d2" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityTaxIdentificationNumber_7a49ef99-7227-4b8e-b9e7-70e3f9ca29d2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_84b4a941-6373-4a2e-83a4-23346dfee18a" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityAddressAddressLine1_84b4a941-6373-4a2e-83a4-23346dfee18a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_603960a4-9bd1-4b4d-8828-4a18d2026709" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityAddressAddressLine2_603960a4-9bd1-4b4d-8828-4a18d2026709" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_f66aabcf-a802-43e0-9fc6-a467d079a658" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityAddressCityOrTown_f66aabcf-a802-43e0-9fc6-a467d079a658" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_c9ea34d0-d4ee-480b-90e6-03568495b9ab" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityAddressStateOrProvince_c9ea34d0-d4ee-480b-90e6-03568495b9ab" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_f2c8b198-13ad-4869-858d-99f6f7d0be92" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityAddressPostalZipCode_f2c8b198-13ad-4869-858d-99f6f7d0be92" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_06b69f2b-e06e-4a35-89f8-5336cc32c474" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_CityAreaCode_06b69f2b-e06e-4a35-89f8-5336cc32c474" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_27419aae-cd34-4dc5-a612-d366069aa9a5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_LocalPhoneNumber_27419aae-cd34-4dc5-a612-d366069aa9a5" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_eefe79d5-caf5-475a-a033-a10bc553d8a2" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_Security12bTitle_eefe79d5-caf5-475a-a033-a10bc553d8a2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_048fad7c-c327-40eb-808a-0033bfe08bac" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_TradingSymbol_048fad7c-c327-40eb-808a-0033bfe08bac" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_d2cd4376-e32b-4a76-9b63-7c7c2b0128d3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_SecurityExchangeName_d2cd4376-e32b-4a76-9b63-7c7c2b0128d3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_94f08e36-464e-4834-8aae-b6fcb8fe0a44" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityCurrentReportingStatus_94f08e36-464e-4834-8aae-b6fcb8fe0a44" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_893b6be9-ab02-4cda-a267-8a758f5f86ee" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityInteractiveDataCurrent_893b6be9-ab02-4cda-a267-8a758f5f86ee" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_69718f2a-6e8f-4a75-a31b-d26ee91bfd11" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityFilerCategory_69718f2a-6e8f-4a75-a31b-d26ee91bfd11" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_feea341d-122f-4dd7-b4de-3b2db766d8e7" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntitySmallBusiness_feea341d-122f-4dd7-b4de-3b2db766d8e7" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_4c3fdeea-93eb-405b-9ebf-7e58c373d0ee" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityEmergingGrowthCompany_4c3fdeea-93eb-405b-9ebf-7e58c373d0ee" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_56742890-288f-405a-b521-ae82a9a6ba2d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityShellCompany_56742890-288f-405a-b521-ae82a9a6ba2d" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_269fbd51-33b0-46e4-b7e4-babce5787f62" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_269fbd51-33b0-46e4-b7e4-babce5787f62" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_75c7aadd-28cd-4a5b-8097-fdde75fc13e8" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntityCentralIndexKey_75c7aadd-28cd-4a5b-8097-fdde75fc13e8" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_3596ce62-fe0d-4612-81d6-42fd2bbbf739" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_CurrentFiscalYearEndDate_3596ce62-fe0d-4612-81d6-42fd2bbbf739" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_50169c94-02e9-4620-aa86-971c38e3b496" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_DocumentFiscalYearFocus_50169c94-02e9-4620-aa86-971c38e3b496" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_70718aa2-93ac-41bd-82ee-3ab90c8c90bf" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_DocumentFiscalPeriodFocus_70718aa2-93ac-41bd-82ee-3ab90c8c90bf" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_b0adcb5a-4f92-48da-9ec6-ff8cad6c6f72" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_AmendmentFlag_b0adcb5a-4f92-48da-9ec6-ff8cad6c6f72" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_5ab04b8d-f733-4ce1-be59-bb3583b2db42" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_9bf30d98-96f3-4a32-8bcf-4ba9eabe3312" xlink:to="loc_dei_EntitiesTable_5ab04b8d-f733-4ce1-be59-bb3583b2db42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_aac43a3c-1923-4ba3-9064-2113fcb5dcca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_5ab04b8d-f733-4ce1-be59-bb3583b2db42" xlink:to="loc_us-gaap_StatementClassOfStockAxis_aac43a3c-1923-4ba3-9064-2113fcb5dcca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_aac43a3c-1923-4ba3-9064-2113fcb5dcca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_aac43a3c-1923-4ba3-9064-2113fcb5dcca" xlink:to="loc_us-gaap_ClassOfStockDomain_aac43a3c-1923-4ba3-9064-2113fcb5dcca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1f858b35-fe62-4fe0-974e-dabbceb78900" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_aac43a3c-1923-4ba3-9064-2113fcb5dcca" xlink:to="loc_us-gaap_ClassOfStockDomain_1f858b35-fe62-4fe0-974e-dabbceb78900" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_7e5e4d1a-fbbd-42c1-a800-2e0a3527966b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1f858b35-fe62-4fe0-974e-dabbceb78900" xlink:to="loc_us-gaap_CommonStockMember_7e5e4d1a-fbbd-42c1-a800-2e0a3527966b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_WarrantsToPurchaseCommonStockMember_b25ae6be-b893-4e29-816a-4be8f5195653" xlink:href="oxy-20230630.xsd#oxy_WarrantsToPurchaseCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1f858b35-fe62-4fe0-974e-dabbceb78900" xlink:to="loc_oxy_WarrantsToPurchaseCommonStockMember_b25ae6be-b893-4e29-816a-4be8f5195653" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/ConsolidatedCondensedBalanceSheets" xlink:type="simple" xlink:href="oxy-20230630.xsd#ConsolidatedCondensedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/ConsolidatedCondensedBalanceSheets" xlink:type="extended" id="i77e59547b3214947a9536659f6de8885_ConsolidatedCondensedBalanceSheets">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_deae86e3-0dc9-48ee-9f65-2eb87c01cf53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_deae86e3-0dc9-48ee-9f65-2eb87c01cf53" xlink:to="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_1fc9c5a6-530e-4af1-afcc-b3d4b7eeb82c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:to="loc_us-gaap_AssetsCurrentAbstract_1fc9c5a6-530e-4af1-afcc-b3d4b7eeb82c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_519bffa0-92e1-424c-9054-14ffdc56fa5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1fc9c5a6-530e-4af1-afcc-b3d4b7eeb82c" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_519bffa0-92e1-424c-9054-14ffdc56fa5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_12f30e56-eed7-4b83-a518-021f72ff3872" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1fc9c5a6-530e-4af1-afcc-b3d4b7eeb82c" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_12f30e56-eed7-4b83-a518-021f72ff3872" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_862b68fd-e6ce-4ad2-a803-b1697f79ebd3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1fc9c5a6-530e-4af1-afcc-b3d4b7eeb82c" xlink:to="loc_us-gaap_InventoryNet_862b68fd-e6ce-4ad2-a803-b1697f79ebd3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_d5c6d2c8-b487-491d-a90c-97011516ea86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1fc9c5a6-530e-4af1-afcc-b3d4b7eeb82c" xlink:to="loc_us-gaap_OtherAssetsCurrent_d5c6d2c8-b487-491d-a90c-97011516ea86" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_4c1d7420-9a89-4b18-81e8-c960b370f4ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1fc9c5a6-530e-4af1-afcc-b3d4b7eeb82c" xlink:to="loc_us-gaap_AssetsCurrent_4c1d7420-9a89-4b18-81e8-c960b370f4ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_fdfd1153-2823-4171-add8-761c094d4ece" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:to="loc_us-gaap_EquityMethodInvestments_fdfd1153-2823-4171-add8-761c094d4ece" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAbstract_b3adc0d6-6918-46b4-88e4-cfebdcffaa48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAbstract_b3adc0d6-6918-46b4-88e4-cfebdcffaa48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_845d0646-ffba-44e5-9348-b5cdc3e5dd45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAbstract_b3adc0d6-6918-46b4-88e4-cfebdcffaa48" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_845d0646-ffba-44e5-9348-b5cdc3e5dd45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_9355c9e6-c833-46bc-9010-a1aa362e141e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAbstract_b3adc0d6-6918-46b4-88e4-cfebdcffaa48" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_9355c9e6-c833-46bc-9010-a1aa362e141e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_d4653ef7-9ae5-435f-964d-2b8423076866" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortizationAbstract_b3adc0d6-6918-46b4-88e4-cfebdcffaa48" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_d4653ef7-9ae5-435f-964d-2b8423076866" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_ae563998-cdce-4a97-91ac-bc3ae0c1a7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_ae563998-cdce-4a97-91ac-bc3ae0c1a7fe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LongTermReceivablesAndOtherNoncurrentAssetsNet_3e54d6d5-2244-4f0c-b7d2-82fd84d45b8a" xlink:href="oxy-20230630.xsd#oxy_LongTermReceivablesAndOtherNoncurrentAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:to="loc_oxy_LongTermReceivablesAndOtherNoncurrentAssetsNet_3e54d6d5-2244-4f0c-b7d2-82fd84d45b8a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_dfcac54e-f74b-4f5b-ab8b-1f84c54da5b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_f21117d9-7905-4ffb-be50-155a2195d340" xlink:to="loc_us-gaap_Assets_dfcac54e-f74b-4f5b-ab8b-1f84c54da5b9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0a8a9b99-4da7-435d-97ca-dc7095f52377" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_deae86e3-0dc9-48ee-9f65-2eb87c01cf53" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0a8a9b99-4da7-435d-97ca-dc7095f52377" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0a8a9b99-4da7-435d-97ca-dc7095f52377" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_89b99cf2-6d6c-4d07-9c91-3d55e3d95545" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_89b99cf2-6d6c-4d07-9c91-3d55e3d95545" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PreferredStockRedemptionAmountPayable_5958d878-5fef-49df-b262-e28411212041" xlink:href="oxy-20230630.xsd#oxy_PreferredStockRedemptionAmountPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:to="loc_oxy_PreferredStockRedemptionAmountPayable_5958d878-5fef-49df-b262-e28411212041" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_d8c6f984-ef78-4b32-9493-3da44b167d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_d8c6f984-ef78-4b32-9493-3da44b167d4a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_4bbf3d3f-e995-4c78-9754-aa37849ff3e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:to="loc_us-gaap_AccountsPayableCurrent_4bbf3d3f-e995-4c78-9754-aa37849ff3e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_33f8649f-5fb8-42e6-9330-fd7ce19865f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_33f8649f-5fb8-42e6-9330-fd7ce19865f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_e5034da4-0460-4c34-b25a-dfe004ce7b43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_2c3412cb-75be-41f9-bbc0-5d64b1f2d495" xlink:to="loc_us-gaap_LiabilitiesCurrent_e5034da4-0460-4c34-b25a-dfe004ce7b43" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrentAbstract_c22fe1a9-0da3-4220-8349-1356dfb2b893" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0a8a9b99-4da7-435d-97ca-dc7095f52377" xlink:to="loc_us-gaap_LongTermDebtNoncurrentAbstract_c22fe1a9-0da3-4220-8349-1356dfb2b893" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_385697a7-12ae-4327-8c18-570e2da2e7eb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtNoncurrentAbstract_c22fe1a9-0da3-4220-8349-1356dfb2b893" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_385697a7-12ae-4327-8c18-570e2da2e7eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0a8a9b99-4da7-435d-97ca-dc7095f52377" xlink:to="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_2d6c5cc4-2b4f-4d4c-9a93-1c32af68af05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_2d6c5cc4-2b4f-4d4c-9a93-1c32af68af05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_faee39f4-fa3e-4e2e-a15d-b4866152b663" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetRetirementObligationsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:to="loc_us-gaap_AssetRetirementObligationsNoncurrent_faee39f4-fa3e-4e2e-a15d-b4866152b663" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_6df82c7f-5e90-48dc-a7c3-144953ab458b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_6df82c7f-5e90-48dc-a7c3-144953ab458b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_25dda56c-3697-497b-a7e1-821ab663fe45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_25dda56c-3697-497b-a7e1-821ab663fe45" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a8844627-112d-44d9-a41a-577e9460f88b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_a8844627-112d-44d9-a41a-577e9460f88b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_770e0177-4b90-4eb1-af33-ccfb9451b6f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_770e0177-4b90-4eb1-af33-ccfb9451b6f1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent_590f8936-d701-4c23-9b84-02230c36558b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesAbstract_a28f868b-37f2-41b1-8cab-9a2ccc324e99" xlink:to="loc_us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent_590f8936-d701-4c23-9b84-02230c36558b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0a8a9b99-4da7-435d-97ca-dc7095f52377" xlink:to="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_c49e6583-e546-4de8-ad0e-4744e0716b1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:to="loc_us-gaap_PreferredStockValue_c49e6583-e546-4de8-ad0e-4744e0716b1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_4fce3360-63d4-49e1-bf35-2b68bcdf8cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:to="loc_us-gaap_CommonStockValue_4fce3360-63d4-49e1-bf35-2b68bcdf8cc1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonValue_aaef9967-a999-4e9c-94a4-df86894dec1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:to="loc_us-gaap_TreasuryStockCommonValue_aaef9967-a999-4e9c-94a4-df86894dec1f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_ed542764-4aff-440c-9adb-568568af2ad3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:to="loc_us-gaap_AdditionalPaidInCapital_ed542764-4aff-440c-9adb-568568af2ad3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_9315946b-c0e2-47e8-a7b6-ad0240057b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_9315946b-c0e2-47e8-a7b6-ad0240057b8d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_c41dd705-ada1-4d89-9570-9e7a3f05ed6f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_c41dd705-ada1-4d89-9570-9e7a3f05ed6f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_8e088811-7da4-497d-8ca0-fa33750440f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d625031d-f3a4-4715-a06b-185f6e65fc4b" xlink:to="loc_us-gaap_StockholdersEquity_8e088811-7da4-497d-8ca0-fa33750440f1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_8bb7098e-95f1-4f95-9162-e3d723343a88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_0a8a9b99-4da7-435d-97ca-dc7095f52377" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_8bb7098e-95f1-4f95-9162-e3d723343a88" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_62915a31-9648-40d6-bc5a-0191a7751728" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_deae86e3-0dc9-48ee-9f65-2eb87c01cf53" xlink:to="loc_us-gaap_StatementTable_62915a31-9648-40d6-bc5a-0191a7751728" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_fb809ebe-0cae-45b8-84a9-b40a9144dc99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_62915a31-9648-40d6-bc5a-0191a7751728" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_fb809ebe-0cae-45b8-84a9-b40a9144dc99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_fb809ebe-0cae-45b8-84a9-b40a9144dc99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_fb809ebe-0cae-45b8-84a9-b40a9144dc99" xlink:to="loc_us-gaap_SegmentDomain_fb809ebe-0cae-45b8-84a9-b40a9144dc99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b2fc2e76-310c-4551-8683-bf292aeadfd1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_fb809ebe-0cae-45b8-84a9-b40a9144dc99" xlink:to="loc_us-gaap_SegmentDomain_b2fc2e76-310c-4551-8683-bf292aeadfd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_OilAndGasSegmentMember_4b9946eb-d5f3-4dc8-8b52-83831e303883" xlink:href="oxy-20230630.xsd#oxy_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b2fc2e76-310c-4551-8683-bf292aeadfd1" xlink:to="loc_oxy_OilAndGasSegmentMember_4b9946eb-d5f3-4dc8-8b52-83831e303883" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ChemicalSegmentMember_449aee02-e83c-4a58-a099-836932da45a5" xlink:href="oxy-20230630.xsd#oxy_ChemicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b2fc2e76-310c-4551-8683-bf292aeadfd1" xlink:to="loc_oxy_ChemicalSegmentMember_449aee02-e83c-4a58-a099-836932da45a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MidstreamSegmentMember_9104c762-ce91-4604-855f-d85413240526" xlink:href="oxy-20230630.xsd#oxy_MidstreamSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b2fc2e76-310c-4551-8683-bf292aeadfd1" xlink:to="loc_oxy_MidstreamSegmentMember_9104c762-ce91-4604-855f-d85413240526" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_5f973d73-66f8-48fb-a75d-e6f5c795a661" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_62915a31-9648-40d6-bc5a-0191a7751728" xlink:to="loc_srt_ConsolidationItemsAxis_5f973d73-66f8-48fb-a75d-e6f5c795a661" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_5f973d73-66f8-48fb-a75d-e6f5c795a661_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_5f973d73-66f8-48fb-a75d-e6f5c795a661" xlink:to="loc_srt_ConsolidationItemsDomain_5f973d73-66f8-48fb-a75d-e6f5c795a661_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_e9fa2502-44f8-4b47-8fdb-ff7857871839" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_5f973d73-66f8-48fb-a75d-e6f5c795a661" xlink:to="loc_srt_ConsolidationItemsDomain_e9fa2502-44f8-4b47-8fdb-ff7857871839" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_a2a34c0f-aa29-44d9-a007-68c2571976e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e9fa2502-44f8-4b47-8fdb-ff7857871839" xlink:to="loc_us-gaap_OperatingSegmentsMember_a2a34c0f-aa29-44d9-a007-68c2571976e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_bcb7e074-ff30-41f1-b40c-1c594c98bb76" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e9fa2502-44f8-4b47-8fdb-ff7857871839" xlink:to="loc_us-gaap_CorporateNonSegmentMember_bcb7e074-ff30-41f1-b40c-1c594c98bb76" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/ConsolidatedCondensedStatementsofEquity" xlink:type="simple" xlink:href="oxy-20230630.xsd#ConsolidatedCondensedStatementsofEquity"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/ConsolidatedCondensedStatementsofEquity" xlink:type="extended" id="i191c4aa14de04fd0981cd9420f60ae1e_ConsolidatedCondensedStatementsofEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_eb57bd55-211f-4c35-aa3b-1609651f31be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_eb57bd55-211f-4c35-aa3b-1609651f31be" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_be727f3d-537c-48c9-b2e0-7aa78c1ff02e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_StockholdersEquity_be727f3d-537c-48c9-b2e0-7aa78c1ff02e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_b18094ee-6d9c-431e-90e5-7d3adcf79f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_NetIncomeLoss_b18094ee-6d9c-431e-90e5-7d3adcf79f1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_b370eddb-d775-42e9-add6-5988f7172e23" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_b370eddb-d775-42e9-add6-5988f7172e23" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_0260d399-aa55-4f45-8de4-545c293c51e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_DividendsCommonStockCash_0260d399-aa55-4f45-8de4-545c293c51e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_5a5b5417-b7f3-411e-a57e-4c1f9706252a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_DividendsPreferredStockCash_5a5b5417-b7f3-411e-a57e-4c1f9706252a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRedeemedOrCalledDuringPeriodValue_9204ca40-6a2d-4d88-877f-a7b00fb6d8fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRedeemedOrCalledDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_StockRedeemedOrCalledDuringPeriodValue_9204ca40-6a2d-4d88-877f-a7b00fb6d8fc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockRedemptionPremium_2ea8603b-b8a2-43bd-94da-9a1476386340" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockRedemptionPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_PreferredStockRedemptionPremium_2ea8603b-b8a2-43bd-94da-9a1476386340" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseInCarryingAmountOfRedeemablePreferredStock_0ce2d3b1-885b-402b-a65c-6d282e5ee932" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseInCarryingAmountOfRedeemablePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_IncreaseInCarryingAmountOfRedeemablePreferredStock_0ce2d3b1-885b-402b-a65c-6d282e5ee932" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_95a1c5ca-e6ab-41b5-8e24-94a8aa7791de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_95a1c5ca-e6ab-41b5-8e24-94a8aa7791de" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_b6f70d99-49a6-47d9-b0d1-4a58d7041d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_b6f70d99-49a6-47d9-b0d1-4a58d7041d2d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_IssuanceOfCommonStockAndOtherNet_10830d97-cc6f-4003-87da-1fa30bbbf07a" xlink:href="oxy-20230630.xsd#oxy_IssuanceOfCommonStockAndOtherNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_oxy_IssuanceOfCommonStockAndOtherNet_10830d97-cc6f-4003-87da-1fa30bbbf07a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_590c91a9-c71d-4d95-9501-f31331bd731d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2c405741-e4ea-43bb-9dd0-e8b289d35633" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_590c91a9-c71d-4d95-9501-f31331bd731d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_ffef3b08-eb01-4f42-b085-2481a16c12d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_0ede59e0-b030-4257-b1fc-bfb69192a3d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_eb57bd55-211f-4c35-aa3b-1609651f31be" xlink:to="loc_us-gaap_StatementTable_0ede59e0-b030-4257-b1fc-bfb69192a3d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_c4871dff-e456-44d8-9d76-69d4f778efb6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0ede59e0-b030-4257-b1fc-bfb69192a3d7" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_c4871dff-e456-44d8-9d76-69d4f778efb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c4871dff-e456-44d8-9d76-69d4f778efb6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c4871dff-e456-44d8-9d76-69d4f778efb6" xlink:to="loc_us-gaap_EquityComponentDomain_c4871dff-e456-44d8-9d76-69d4f778efb6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c4871dff-e456-44d8-9d76-69d4f778efb6" xlink:to="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_eb90ae26-b1e7-41c8-8319-629abd2ae85a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:to="loc_us-gaap_PreferredStockMember_eb90ae26-b1e7-41c8-8319-629abd2ae85a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_d8e4d153-66f2-4b15-8a91-9a5edbcec758" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:to="loc_us-gaap_CommonStockMember_d8e4d153-66f2-4b15-8a91-9a5edbcec758" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_c3f464b0-7ec7-4f06-8a73-cb4f10cf15fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:to="loc_us-gaap_TreasuryStockCommonMember_c3f464b0-7ec7-4f06-8a73-cb4f10cf15fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_01b62d91-065c-4e7e-b068-4f5a103a4e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_01b62d91-065c-4e7e-b068-4f5a103a4e5a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_0d6ee9f0-970d-43f3-9b26-2cd1ff2b28be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:to="loc_us-gaap_RetainedEarningsMember_0d6ee9f0-970d-43f3-9b26-2cd1ff2b28be" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_48643988-b4c5-434a-a4df-679cd65d6d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_08514120-c92a-42a8-91e3-5e2975498ab1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_48643988-b4c5-434a-a4df-679cd65d6d5c" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/GENERALNarrativeDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#GENERALNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/GENERALNarrativeDetails" xlink:type="extended" id="i296691c36f6d47a99361f70628031e83_GENERALNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:href="oxy-20230630.xsd#oxy_SummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPNonVotingGeneralPartnerUnitInterestPercentage_13598cea-c3fc-4ee2-a9ce-b257ca995a97" xlink:href="oxy-20230630.xsd#oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPNonVotingGeneralPartnerUnitInterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:to="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPNonVotingGeneralPartnerUnitInterestPercentage_13598cea-c3fc-4ee2-a9ce-b257ca995a97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPLimitedPartnerUnitOwnershipInterest_bb5e84a9-faf8-43c8-93e3-73fb299ba5b0" xlink:href="oxy-20230630.xsd#oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPLimitedPartnerUnitOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:to="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPLimitedPartnerUnitOwnershipInterest_bb5e84a9-faf8-43c8-93e3-73fb299ba5b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPNonVotingLimitedPartnerUnitInterestPercentage_e637a0fe-9209-4783-a23a-d018bc0afc7a" xlink:href="oxy-20230630.xsd#oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPNonVotingLimitedPartnerUnitInterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:to="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPNonVotingLimitedPartnerUnitInterestPercentage_e637a0fe-9209-4783-a23a-d018bc0afc7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPEffectiveEconomicInterestPercentage_273fc16a-4d3b-4ead-823c-f2b9cc7a9a08" xlink:href="oxy-20230630.xsd#oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPEffectiveEconomicInterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:to="loc_oxy_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPEffectiveEconomicInterestPercentage_273fc16a-4d3b-4ead-823c-f2b9cc7a9a08" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_b0e780fd-14d9-49ef-92f7-9e314a44d885" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:to="loc_us-gaap_AssetImpairmentCharges_b0e780fd-14d9-49ef-92f7-9e314a44d885" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_cab0e6ca-c3ae-4094-9e75-c6f4e1ba941c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:to="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_cab0e6ca-c3ae-4094-9e75-c6f4e1ba941c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SummaryOfSignificantAccountingPoliciesTable_87669433-70ec-4257-83e3-747de2eaa180" xlink:href="oxy-20230630.xsd#oxy_SummaryOfSignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesLineItems_535ecc33-d145-47a9-a699-388d6ddf7c9f" xlink:to="loc_oxy_SummaryOfSignificantAccountingPoliciesTable_87669433-70ec-4257-83e3-747de2eaa180" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_d861e99a-6490-4895-9cda-fca7c5c14eec" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesTable_87669433-70ec-4257-83e3-747de2eaa180" xlink:to="loc_srt_OwnershipAxis_d861e99a-6490-4895-9cda-fca7c5c14eec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_d861e99a-6490-4895-9cda-fca7c5c14eec_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_d861e99a-6490-4895-9cda-fca7c5c14eec" xlink:to="loc_srt_OwnershipDomain_d861e99a-6490-4895-9cda-fca7c5c14eec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_6609f907-30c0-4c22-9244-9e933e6c44f4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_d861e99a-6490-4895-9cda-fca7c5c14eec" xlink:to="loc_srt_OwnershipDomain_6609f907-30c0-4c22-9244-9e933e6c44f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_WesternMidstreamPartnersLPMember_fcdc08e1-c198-4267-a629-1c809773355c" xlink:href="oxy-20230630.xsd#oxy_WesternMidstreamPartnersLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_6609f907-30c0-4c22-9244-9e933e6c44f4" xlink:to="loc_oxy_WesternMidstreamPartnersLPMember_fcdc08e1-c198-4267-a629-1c809773355c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aba8983e-8e5c-4838-8b70-07f0d4bd4fca" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesTable_87669433-70ec-4257-83e3-747de2eaa180" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aba8983e-8e5c-4838-8b70-07f0d4bd4fca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_aba8983e-8e5c-4838-8b70-07f0d4bd4fca_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aba8983e-8e5c-4838-8b70-07f0d4bd4fca" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_aba8983e-8e5c-4838-8b70-07f0d4bd4fca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_13e42a55-7988-4d1e-bff2-6ff0645b7b10" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_aba8983e-8e5c-4838-8b70-07f0d4bd4fca" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_13e42a55-7988-4d1e-bff2-6ff0645b7b10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_WesternMidstreamPartnersLPMember_da63644f-207e-4cec-a495-bb0e0961c01c" xlink:href="oxy-20230630.xsd#oxy_WesternMidstreamPartnersLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_13e42a55-7988-4d1e-bff2-6ff0645b7b10" xlink:to="loc_oxy_WesternMidstreamPartnersLPMember_da63644f-207e-4cec-a495-bb0e0961c01c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_BlackButteCoalCompanyMember_378fc75e-6a80-4397-afe4-e17f28f8e2e0" xlink:href="oxy-20230630.xsd#oxy_BlackButteCoalCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_13e42a55-7988-4d1e-bff2-6ff0645b7b10" xlink:to="loc_oxy_BlackButteCoalCompanyMember_378fc75e-6a80-4397-afe4-e17f28f8e2e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4318c28d-fb48-4836-8d01-51a8e131c0c5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_oxy_SummaryOfSignificantAccountingPoliciesTable_87669433-70ec-4257-83e3-747de2eaa180" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4318c28d-fb48-4836-8d01-51a8e131c0c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4318c28d-fb48-4836-8d01-51a8e131c0c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4318c28d-fb48-4836-8d01-51a8e131c0c5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4318c28d-fb48-4836-8d01-51a8e131c0c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c0f46bbb-26d1-4e46-9925-fe01a242050c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4318c28d-fb48-4836-8d01-51a8e131c0c5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c0f46bbb-26d1-4e46-9925-fe01a242050c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_07640938-8289-4adc-a31f-4591615a705e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c0f46bbb-26d1-4e46-9925-fe01a242050c" xlink:to="loc_us-gaap_LandMember_07640938-8289-4adc-a31f-4591615a705e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/REVENUEScheduleofRevenuefromCustomersbySegmentProductandGeographicalAreaDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#REVENUEScheduleofRevenuefromCustomersbySegmentProductandGeographicalAreaDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/REVENUEScheduleofRevenuefromCustomersbySegmentProductandGeographicalAreaDetails" xlink:type="extended" id="i58f44d4be8d64092a1435a4e8ffdc5a1_REVENUEScheduleofRevenuefromCustomersbySegmentProductandGeographicalAreaDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_22f9a043-fb8e-406e-b423-4320a9944088" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2997c54a-a9c6-4179-84d6-ec27fed2aeb3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_22f9a043-fb8e-406e-b423-4320a9944088" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2997c54a-a9c6-4179-84d6-ec27fed2aeb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_0d8534f0-6b65-411a-b66c-c9a23fd0db25" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_22f9a043-fb8e-406e-b423-4320a9944088" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_0d8534f0-6b65-411a-b66c-c9a23fd0db25" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_b2a873f2-9b4a-4e3f-9b27-3a094aaeb3c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0d8534f0-6b65-411a-b66c-c9a23fd0db25" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_b2a873f2-9b4a-4e3f-9b27-3a094aaeb3c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b2a873f2-9b4a-4e3f-9b27-3a094aaeb3c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b2a873f2-9b4a-4e3f-9b27-3a094aaeb3c2" xlink:to="loc_us-gaap_SegmentDomain_b2a873f2-9b4a-4e3f-9b27-3a094aaeb3c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b7cb0bea-a9c1-4694-84a9-8fe36feeeb86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b2a873f2-9b4a-4e3f-9b27-3a094aaeb3c2" xlink:to="loc_us-gaap_SegmentDomain_b7cb0bea-a9c1-4694-84a9-8fe36feeeb86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_OilAndGasSegmentMember_83139842-04c0-4d82-8c88-cb5539e2d311" xlink:href="oxy-20230630.xsd#oxy_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b7cb0bea-a9c1-4694-84a9-8fe36feeeb86" xlink:to="loc_oxy_OilAndGasSegmentMember_83139842-04c0-4d82-8c88-cb5539e2d311" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ChemicalSegmentMember_928e4eda-1f6b-4cc7-a50b-4228dcf84f64" xlink:href="oxy-20230630.xsd#oxy_ChemicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b7cb0bea-a9c1-4694-84a9-8fe36feeeb86" xlink:to="loc_oxy_ChemicalSegmentMember_928e4eda-1f6b-4cc7-a50b-4228dcf84f64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MidstreamAndMarketingMember_e6b1b579-4157-46dc-8517-193bc82e32a8" xlink:href="oxy-20230630.xsd#oxy_MidstreamAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b7cb0bea-a9c1-4694-84a9-8fe36feeeb86" xlink:to="loc_oxy_MidstreamAndMarketingMember_e6b1b579-4157-46dc-8517-193bc82e32a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_27569132-f94a-4c1d-9592-329345748106" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0d8534f0-6b65-411a-b66c-c9a23fd0db25" xlink:to="loc_srt_ConsolidationItemsAxis_27569132-f94a-4c1d-9592-329345748106" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_27569132-f94a-4c1d-9592-329345748106_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_27569132-f94a-4c1d-9592-329345748106" xlink:to="loc_srt_ConsolidationItemsDomain_27569132-f94a-4c1d-9592-329345748106_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_b457f3ae-aa6a-47e4-85a5-229deb10dbbf" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_27569132-f94a-4c1d-9592-329345748106" xlink:to="loc_srt_ConsolidationItemsDomain_b457f3ae-aa6a-47e4-85a5-229deb10dbbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_facade48-4c33-4281-8f2b-75a342951610" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_b457f3ae-aa6a-47e4-85a5-229deb10dbbf" xlink:to="loc_us-gaap_OperatingSegmentsMember_facade48-4c33-4281-8f2b-75a342951610" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_3e422c34-1572-4a52-97a8-bf5c330f6cef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_b457f3ae-aa6a-47e4-85a5-229deb10dbbf" xlink:to="loc_us-gaap_IntersegmentEliminationMember_3e422c34-1572-4a52-97a8-bf5c330f6cef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_f6c221bd-4eca-4dc7-b8d9-c5cc01d39a55" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0d8534f0-6b65-411a-b66c-c9a23fd0db25" xlink:to="loc_srt_StatementGeographicalAxis_f6c221bd-4eca-4dc7-b8d9-c5cc01d39a55" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_f6c221bd-4eca-4dc7-b8d9-c5cc01d39a55_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_f6c221bd-4eca-4dc7-b8d9-c5cc01d39a55" xlink:to="loc_srt_SegmentGeographicalDomain_f6c221bd-4eca-4dc7-b8d9-c5cc01d39a55_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_20a65aaf-de7f-4841-bcd1-20210d67f8fb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_f6c221bd-4eca-4dc7-b8d9-c5cc01d39a55" xlink:to="loc_srt_SegmentGeographicalDomain_20a65aaf-de7f-4841-bcd1-20210d67f8fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_30ad8fda-5594-4350-afd1-3766cb000e47" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_20a65aaf-de7f-4841-bcd1-20210d67f8fb" xlink:to="loc_country_US_30ad8fda-5594-4350-afd1-3766cb000e47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_00551e02-a83a-44ac-83ca-79e04b908567" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_20a65aaf-de7f-4841-bcd1-20210d67f8fb" xlink:to="loc_us-gaap_NonUsMember_00551e02-a83a-44ac-83ca-79e04b908567" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_25e13b5c-5779-49f6-82d3-c26fb58a8f63" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_0d8534f0-6b65-411a-b66c-c9a23fd0db25" xlink:to="loc_srt_ProductOrServiceAxis_25e13b5c-5779-49f6-82d3-c26fb58a8f63" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_25e13b5c-5779-49f6-82d3-c26fb58a8f63_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_25e13b5c-5779-49f6-82d3-c26fb58a8f63" xlink:to="loc_srt_ProductsAndServicesDomain_25e13b5c-5779-49f6-82d3-c26fb58a8f63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f09ebdcc-7748-4d81-b162-c243bf52b7aa" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_25e13b5c-5779-49f6-82d3-c26fb58a8f63" xlink:to="loc_srt_ProductsAndServicesDomain_f09ebdcc-7748-4d81-b162-c243bf52b7aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OilReservesMember_a61a6630-b4b1-46a4-b3b3-95cc128d815c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OilReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f09ebdcc-7748-4d81-b162-c243bf52b7aa" xlink:to="loc_srt_OilReservesMember_a61a6630-b4b1-46a4-b3b3-95cc128d815c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasLiquidsReservesMember_134f196d-1fa4-400d-b2e7-6472c28b9a66" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NaturalGasLiquidsReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f09ebdcc-7748-4d81-b162-c243bf52b7aa" xlink:to="loc_srt_NaturalGasLiquidsReservesMember_134f196d-1fa4-400d-b2e7-6472c28b9a66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasReservesMember_b3195929-7ab4-44d0-b405-ea15b749a9dc" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NaturalGasReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f09ebdcc-7748-4d81-b162-c243bf52b7aa" xlink:to="loc_srt_NaturalGasReservesMember_b3195929-7ab4-44d0-b405-ea15b749a9dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_5f3b4769-a47a-4700-8dd5-567dd88ffdd4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f09ebdcc-7748-4d81-b162-c243bf52b7aa" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_5f3b4769-a47a-4700-8dd5-567dd88ffdd4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/LONGTERMDEBTScheduleofLongtermDebtDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#LONGTERMDEBTScheduleofLongtermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/LONGTERMDEBTScheduleofLongtermDebtDetails" xlink:type="extended" id="i70e3aca68e2a4a1d945022889fed8abb_LONGTERMDEBTScheduleofLongtermDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_55cca683-6d6a-498c-9bfa-61b28d5e4e26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_55cca683-6d6a-498c-9bfa-61b28d5e4e26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_8bf8cf9f-2b15-45fb-a87f-72f0ec2e9bd9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_8bf8cf9f-2b15-45fb-a87f-72f0ec2e9bd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_7b076577-c0c2-4f76-aa18-73f02e55052e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_7b076577-c0c2-4f76-aa18-73f02e55052e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_42463283-8ee4-4999-846d-3e31bf14aa3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_42463283-8ee4-4999-846d-3e31bf14aa3e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_332097ad-2865-42b2-8e1d-13ece441272e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_332097ad-2865-42b2-8e1d-13ece441272e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_8fbc8eee-c5f4-4c97-9f7b-e8bd2e69e526" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_LongTermDebt_8fbc8eee-c5f4-4c97-9f7b-e8bd2e69e526" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_cf0a8f0c-0723-4c0f-9cfe-dd5a37870461" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_cf0a8f0c-0723-4c0f-9cfe-dd5a37870461" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_3220313d-e848-4b30-9a43-e9524a40745e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_3220313d-e848-4b30-9a43-e9524a40745e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_318ace58-16fc-4ea7-a943-f689405da520" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_318ace58-16fc-4ea7-a943-f689405da520" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_FinanceLeaseLiabilityCurrentMaturities_7506dcfc-95ec-4611-82ce-66cc1883db7e" xlink:href="oxy-20230630.xsd#oxy_FinanceLeaseLiabilityCurrentMaturities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_oxy_FinanceLeaseLiabilityCurrentMaturities_7506dcfc-95ec-4611-82ce-66cc1883db7e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LongTermDebtCurrentMaturitiesExcludingFinanceLeases_50923b4c-8d45-49c2-8f08-0f3d5ebe2c35" xlink:href="oxy-20230630.xsd#oxy_LongTermDebtCurrentMaturitiesExcludingFinanceLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_oxy_LongTermDebtCurrentMaturitiesExcludingFinanceLeases_50923b4c-8d45-49c2-8f08-0f3d5ebe2c35" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_aac7da97-8605-41bd-aa81-d61af89e68fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_aac7da97-8605-41bd-aa81-d61af89e68fc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_f0775fb7-7e49-4713-ac9a-ca3bf7656e75" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cc8a7b81-dd15-4807-be32-7fbd7b1f9bf8" xlink:to="loc_us-gaap_DebtInstrumentTable_f0775fb7-7e49-4713-ac9a-ca3bf7656e75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_979bc4b9-35a9-4974-86f7-caa46cd25255" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f0775fb7-7e49-4713-ac9a-ca3bf7656e75" xlink:to="loc_us-gaap_DebtInstrumentAxis_979bc4b9-35a9-4974-86f7-caa46cd25255" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_979bc4b9-35a9-4974-86f7-caa46cd25255_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_979bc4b9-35a9-4974-86f7-caa46cd25255" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_979bc4b9-35a9-4974-86f7-caa46cd25255_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_979bc4b9-35a9-4974-86f7-caa46cd25255" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MediumTermNotes8.750PercentDue2023Member_a145a1d4-39a4-465d-9df9-f4ae831261b1" xlink:href="oxy-20230630.xsd#oxy_MediumTermNotes8.750PercentDue2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_MediumTermNotes8.750PercentDue2023Member_a145a1d4-39a4-465d-9df9-f4ae831261b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes2.900PercentDue2024Member_61d7a547-da74-4091-b81c-1026dabaf2eb" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes2.900PercentDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes2.900PercentDue2024Member_61d7a547-da74-4091-b81c-1026dabaf2eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes6.950PercentDue2024Member_88d2128f-2d0b-406e-b87f-54a7347b422b" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes6.950PercentDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes6.950PercentDue2024Member_88d2128f-2d0b-406e-b87f-54a7347b422b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes3.450PercentDue2024Member_38bba54e-38a4-491c-a880-a62887701948" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes3.450PercentDue2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes3.450PercentDue2024Member_38bba54e-38a4-491c-a880-a62887701948" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes5875PercentDue2025Member_6be1ad2f-1fd7-48ef-be27-3b7745880aec" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes5875PercentDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes5875PercentDue2025Member_6be1ad2f-1fd7-48ef-be27-3b7745880aec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes3.500PercentDue2025Member_9f9c2dbe-cee1-4c08-8c26-9b39e854656e" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes3.500PercentDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes3.500PercentDue2025Member_9f9c2dbe-cee1-4c08-8c26-9b39e854656e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes5500PercentDue2025Member_dd928063-f602-431b-9751-a00e03b211ac" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes5500PercentDue2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes5500PercentDue2025Member_dd928063-f602-431b-9751-a00e03b211ac" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes5550PercentDue2026Member_f0cb8f7e-0718-475c-8f67-892cf27ec08b" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes5550PercentDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes5550PercentDue2026Member_f0cb8f7e-0718-475c-8f67-892cf27ec08b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes3.200PercentDue2026Member_064910fd-5915-49d8-af43-631b1a8b0d14" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes3.200PercentDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes3.200PercentDue2026Member_064910fd-5915-49d8-af43-631b1a8b0d14" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes3.400PercentDue2026Member_440c82d7-9308-49b0-84aa-c81927776bba" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes3.400PercentDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes3.400PercentDue2026Member_440c82d7-9308-49b0-84aa-c81927776bba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.500PercentDue2026Member_26c72303-54d1-4cbc-969b-ed80b82da008" xlink:href="oxy-20230630.xsd#oxy_Debentures7.500PercentDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.500PercentDue2026Member_26c72303-54d1-4cbc-969b-ed80b82da008" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes8500PercentDue2027Member_13f20240-8720-404b-a48a-1a0f88dfc628" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes8500PercentDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes8500PercentDue2027Member_13f20240-8720-404b-a48a-1a0f88dfc628" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes3.000PercentDue2027Member_ec4df0ca-9325-49b1-8084-0b14efb570fc" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes3.000PercentDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes3.000PercentDue2027Member_ec4df0ca-9325-49b1-8084-0b14efb570fc" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.125PercentDue2027Member_d9002e96-d446-48e8-8702-892404908812" xlink:href="oxy-20230630.xsd#oxy_Debentures7.125PercentDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.125PercentDue2027Member_d9002e96-d446-48e8-8702-892404908812" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.000PercentDue2027Member_d87d06cf-a1c8-4eaf-b950-ab1211e5d667" xlink:href="oxy-20230630.xsd#oxy_Debentures7.000PercentDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.000PercentDue2027Member_d87d06cf-a1c8-4eaf-b950-ab1211e5d667" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures6.625PercentDue2028Member_c77f5f63-8b63-4493-a4f1-eedc4afad08c" xlink:href="oxy-20230630.xsd#oxy_Debentures6.625PercentDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures6.625PercentDue2028Member_c77f5f63-8b63-4493-a4f1-eedc4afad08c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.150PercentDue2028Member_6910ac74-36d2-4dd4-a8c6-1c4c6279cb27" xlink:href="oxy-20230630.xsd#oxy_Debentures7.150PercentDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.150PercentDue2028Member_6910ac74-36d2-4dd4-a8c6-1c4c6279cb27" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorDebentures7.200PercentDue2028Member_ab71127e-10d5-4967-9ccb-95018ac27a56" xlink:href="oxy-20230630.xsd#oxy_SeniorDebentures7.200PercentDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorDebentures7.200PercentDue2028Member_ab71127e-10d5-4967-9ccb-95018ac27a56" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes6375PercentDue2028Member_a18ce140-9f39-437a-b76a-448db475d65b" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes6375PercentDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes6375PercentDue2028Member_a18ce140-9f39-437a-b76a-448db475d65b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.200PercentDue2029Member_466b6ef0-6bde-4432-95ee-b61d522d23da" xlink:href="oxy-20230630.xsd#oxy_Debentures7.200PercentDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.200PercentDue2029Member_466b6ef0-6bde-4432-95ee-b61d522d23da" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.950PercentDue2029Member_1865ccbf-6497-45b4-bbdc-191cee012d38" xlink:href="oxy-20230630.xsd#oxy_Debentures7.950PercentDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.950PercentDue2029Member_1865ccbf-6497-45b4-bbdc-191cee012d38" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes8450PercentDue2029Member_d1112150-4ace-4f67-8d9c-5f14c2338751" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes8450PercentDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes8450PercentDue2029Member_d1112150-4ace-4f67-8d9c-5f14c2338751" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes3.500PercentDue2029Member_2f3c48b5-e557-41b6-b7ba-dcecf2b01be0" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes3.500PercentDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes3.500PercentDue2029Member_2f3c48b5-e557-41b6-b7ba-dcecf2b01be0" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_VariableRateBondsDue2030Member_e1ffc40b-0e6c-4a70-b695-951dcf75b026" xlink:href="oxy-20230630.xsd#oxy_VariableRateBondsDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_VariableRateBondsDue2030Member_e1ffc40b-0e6c-4a70-b695-951dcf75b026" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes8875PercentDue2030Member_cdf675f9-139e-4788-a60e-97e2ac5d2f6b" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes8875PercentDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes8875PercentDue2030Member_cdf675f9-139e-4788-a60e-97e2ac5d2f6b" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes6625PercentDue2030Member_e942c28c-617b-4602-8351-97d155d5d134" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes6625PercentDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes6625PercentDue2030Member_e942c28c-617b-4602-8351-97d155d5d134" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes6125PercentDue2031Member_f13bb973-3a4e-4bd9-a731-afd03b1df9f6" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes6125PercentDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes6125PercentDue2031Member_f13bb973-3a4e-4bd9-a731-afd03b1df9f6" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes7.500PercentDue2031Member_69401e10-aeed-4c90-b34b-bbccef381205" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes7.500PercentDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes7.500PercentDue2031Member_69401e10-aeed-4c90-b34b-bbccef381205" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes7.875PercentDue2031Member_62bf8ad8-8111-4a2b-bfaa-fc235564b282" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes7.875PercentDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes7.875PercentDue2031Member_62bf8ad8-8111-4a2b-bfaa-fc235564b282" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes6.450PercentDue2036Member_d86be69f-be45-4652-b4ad-c85cfe6df857" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes6.450PercentDue2036Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes6.450PercentDue2036Member_d86be69f-be45-4652-b4ad-c85cfe6df857" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ZeroCouponSeniorNotesDue2036Member_c9f27ca0-e757-40b3-81a7-0edb021017fd" xlink:href="oxy-20230630.xsd#oxy_ZeroCouponSeniorNotesDue2036Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_ZeroCouponSeniorNotesDue2036Member_c9f27ca0-e757-40b3-81a7-0edb021017fd" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes4.300PercentDue2039Member_520ea30d-6884-4fbf-97b1-97d54a7f1082" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes4.300PercentDue2039Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes4.300PercentDue2039Member_520ea30d-6884-4fbf-97b1-97d54a7f1082" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes7.950PercentDue2039Member_6fc12914-9480-431e-8684-2778ebd54ef7" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes7.950PercentDue2039Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes7.950PercentDue2039Member_6fc12914-9480-431e-8684-2778ebd54ef7" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes6.200PercentDue2040Member_64344e41-2b73-45b3-b0a6-48459fdd226c" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes6.200PercentDue2040Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes6.200PercentDue2040Member_64344e41-2b73-45b3-b0a6-48459fdd226c" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes4.500PercentDue2044Member_e458a65b-bb26-495d-96d7-8f058fe69b40" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes4.500PercentDue2044Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes4.500PercentDue2044Member_e458a65b-bb26-495d-96d7-8f058fe69b40" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes4.625PercentDue2045Member_05e7ad79-15dc-4f8c-885d-838a368cf950" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes4.625PercentDue2045Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes4.625PercentDue2045Member_05e7ad79-15dc-4f8c-885d-838a368cf950" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes6.600PercentDue2046Member_47fb3815-2262-4c6a-86f9-72cd2158b5c4" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes6.600PercentDue2046Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes6.600PercentDue2046Member_47fb3815-2262-4c6a-86f9-72cd2158b5c4" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes4.400PercentDue2046Member_82763739-8e21-471a-93ff-1393a4f9b61f" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes4.400PercentDue2046Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes4.400PercentDue2046Member_82763739-8e21-471a-93ff-1393a4f9b61f" xlink:type="arc" order="37"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes4.100PercentDue2047Member_e2b5767a-8097-492c-9552-ec52b6ac438e" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes4.100PercentDue2047Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes4.100PercentDue2047Member_e2b5767a-8097-492c-9552-ec52b6ac438e" xlink:type="arc" order="38"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes4.200PercentDue2048Member_f2023185-c219-4b42-a14f-3404274dbd52" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes4.200PercentDue2048Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes4.200PercentDue2048Member_f2023185-c219-4b42-a14f-3404274dbd52" xlink:type="arc" order="39"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SeniorNotes4.400PercentDue2049Member_dc2278a6-186d-42ea-9412-f44dd41c72de" xlink:href="oxy-20230630.xsd#oxy_SeniorNotes4.400PercentDue2049Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_SeniorNotes4.400PercentDue2049Member_dc2278a6-186d-42ea-9412-f44dd41c72de" xlink:type="arc" order="40"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.730PercentDue2096Member_44713a0e-e66a-4b25-9123-1e30a278558d" xlink:href="oxy-20230630.xsd#oxy_Debentures7.730PercentDue2096Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.730PercentDue2096Member_44713a0e-e66a-4b25-9123-1e30a278558d" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.500PercentDue2096Member_e7f8e7be-f68b-4fc2-9525-0417705ad838" xlink:href="oxy-20230630.xsd#oxy_Debentures7.500PercentDue2096Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.500PercentDue2096Member_e7f8e7be-f68b-4fc2-9525-0417705ad838" xlink:type="arc" order="42"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_Debentures7.250PercentDue2096Member_a67ede2a-c19f-478f-8ca3-f857615af38f" xlink:href="oxy-20230630.xsd#oxy_Debentures7.250PercentDue2096Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_63393715-b00b-468e-802f-fa239aaf2174" xlink:to="loc_oxy_Debentures7.250PercentDue2096Member_a67ede2a-c19f-478f-8ca3-f857615af38f" xlink:type="arc" order="43"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_69cec17a-704b-473c-a953-7109d237ea18" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f0775fb7-7e49-4713-ac9a-ca3bf7656e75" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_69cec17a-704b-473c-a953-7109d237ea18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_69cec17a-704b-473c-a953-7109d237ea18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_69cec17a-704b-473c-a953-7109d237ea18" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_69cec17a-704b-473c-a953-7109d237ea18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_758e5cf6-473b-4a88-906e-d2d6c8f17c73" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_69cec17a-704b-473c-a953-7109d237ea18" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_758e5cf6-473b-4a88-906e-d2d6c8f17c73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotesMember_9ff54545-bc49-460a-acba-811873c1efb7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MediumTermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_758e5cf6-473b-4a88-906e-d2d6c8f17c73" xlink:to="loc_us-gaap_MediumTermNotesMember_9ff54545-bc49-460a-acba-811873c1efb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_58d91ee8-8483-4163-8282-45fe52087b28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_758e5cf6-473b-4a88-906e-d2d6c8f17c73" xlink:to="loc_us-gaap_SeniorNotesMember_58d91ee8-8483-4163-8282-45fe52087b28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_DebenturesMember_175e405f-7fbe-4975-bad5-9b4168385dfe" xlink:href="oxy-20230630.xsd#oxy_DebenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_758e5cf6-473b-4a88-906e-d2d6c8f17c73" xlink:to="loc_oxy_DebenturesMember_175e405f-7fbe-4975-bad5-9b4168385dfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_VariableRateBondsMember_ebb158f6-e738-4fb3-9af3-8733cf15c270" xlink:href="oxy-20230630.xsd#oxy_VariableRateBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_758e5cf6-473b-4a88-906e-d2d6c8f17c73" xlink:to="loc_oxy_VariableRateBondsMember_ebb158f6-e738-4fb3-9af3-8733cf15c270" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/LONGTERMDEBTNarrativeDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#LONGTERMDEBTNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/LONGTERMDEBTNarrativeDetails" xlink:type="extended" id="ief3f951578384a40ba6f92ee8904ee88_LONGTERMDEBTNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_432f847e-1f7d-455e-9cae-635c0fd45bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_3378e7d8-7f8b-4a88-adc0-0734dccb6193" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_432f847e-1f7d-455e-9cae-635c0fd45bbf" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_3378e7d8-7f8b-4a88-adc0-0734dccb6193" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_29e73be2-32bf-4016-9df7-93ebcfd963cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_432f847e-1f7d-455e-9cae-635c0fd45bbf" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_29e73be2-32bf-4016-9df7-93ebcfd963cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_0d4144b5-5b3d-40f7-bf97-d3e97ad8aa17" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_432f847e-1f7d-455e-9cae-635c0fd45bbf" xlink:to="loc_us-gaap_LongTermDebtFairValue_0d4144b5-5b3d-40f7-bf97-d3e97ad8aa17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_6dbae97f-f59d-482c-972c-83f38d7be9d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_432f847e-1f7d-455e-9cae-635c0fd45bbf" xlink:to="loc_us-gaap_DebtInstrumentTable_6dbae97f-f59d-482c-972c-83f38d7be9d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_634f583c-6c1a-4d4d-802a-6009475de5b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_6dbae97f-f59d-482c-972c-83f38d7be9d7" xlink:to="loc_us-gaap_DebtInstrumentAxis_634f583c-6c1a-4d4d-802a-6009475de5b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_634f583c-6c1a-4d4d-802a-6009475de5b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_634f583c-6c1a-4d4d-802a-6009475de5b8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_634f583c-6c1a-4d4d-802a-6009475de5b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e81f3574-eb1d-42b6-b9b3-cb7f1588cf48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_634f583c-6c1a-4d4d-802a-6009475de5b8" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e81f3574-eb1d-42b6-b9b3-cb7f1588cf48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MediumTermNotes8.750PercentDue2023Member_6adc0e52-1d28-4ff0-a2bf-0f190d2d45e0" xlink:href="oxy-20230630.xsd#oxy_MediumTermNotes8.750PercentDue2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_e81f3574-eb1d-42b6-b9b3-cb7f1588cf48" xlink:to="loc_oxy_MediumTermNotes8.750PercentDue2023Member_6adc0e52-1d28-4ff0-a2bf-0f190d2d45e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_102bbbdf-d8bd-47bc-a997-4810ca717d14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_6dbae97f-f59d-482c-972c-83f38d7be9d7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_102bbbdf-d8bd-47bc-a997-4810ca717d14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_102bbbdf-d8bd-47bc-a997-4810ca717d14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_102bbbdf-d8bd-47bc-a997-4810ca717d14" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_102bbbdf-d8bd-47bc-a997-4810ca717d14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f3042ed1-f901-4ebe-b467-30ad44ffee7c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_102bbbdf-d8bd-47bc-a997-4810ca717d14" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f3042ed1-f901-4ebe-b467-30ad44ffee7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotesMember_c9fa408a-e76c-4684-8fab-20da3cbdb70f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MediumTermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_f3042ed1-f901-4ebe-b467-30ad44ffee7c" xlink:to="loc_us-gaap_MediumTermNotesMember_c9fa408a-e76c-4684-8fab-20da3cbdb70f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_afdf8dd5-592b-40ad-a4f1-6c8d15a151a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_6dbae97f-f59d-482c-972c-83f38d7be9d7" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_afdf8dd5-592b-40ad-a4f1-6c8d15a151a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_afdf8dd5-592b-40ad-a4f1-6c8d15a151a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_afdf8dd5-592b-40ad-a4f1-6c8d15a151a1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_afdf8dd5-592b-40ad-a4f1-6c8d15a151a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2748436a-7fa2-4166-b831-de3bc65cb62d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_afdf8dd5-592b-40ad-a4f1-6c8d15a151a1" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2748436a-7fa2-4166-b831-de3bc65cb62d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_b43192e9-6e32-4c3f-a1dd-f13b3363cacc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2748436a-7fa2-4166-b831-de3bc65cb62d" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_b43192e9-6e32-4c3f-a1dd-f13b3363cacc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_629b1344-0f4b-45bb-b244-d1064151f4eb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_6dbae97f-f59d-482c-972c-83f38d7be9d7" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_629b1344-0f4b-45bb-b244-d1064151f4eb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_629b1344-0f4b-45bb-b244-d1064151f4eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_629b1344-0f4b-45bb-b244-d1064151f4eb" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_629b1344-0f4b-45bb-b244-d1064151f4eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_dd2dacaa-c844-414a-b7ed-cf2c7cde5b24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_629b1344-0f4b-45bb-b244-d1064151f4eb" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_dd2dacaa-c844-414a-b7ed-cf2c7cde5b24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_52e960e7-5c40-4d21-a5f1-c77de106a36d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_dd2dacaa-c844-414a-b7ed-cf2c7cde5b24" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_52e960e7-5c40-4d21-a5f1-c77de106a36d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_d5692e0b-d7d6-4a74-b95c-b10f3fb91920" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_52e960e7-5c40-4d21-a5f1-c77de106a36d" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_d5692e0b-d7d6-4a74-b95c-b10f3fb91920" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/DERIVATIVESScheduleofMarketingDerivativesDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#DERIVATIVESScheduleofMarketingDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/DERIVATIVESScheduleofMarketingDerivativesDetails" xlink:type="extended" id="i3deef2cec697441aab73ad86fe38d6dd_DERIVATIVESScheduleofMarketingDerivativesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_ffabdb75-4533-42bd-89bf-3d2d1af7690e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AverageSalesPrices_caef8a40-d94b-4fe6-8614-610279f0a970" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AverageSalesPrices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ffabdb75-4533-42bd-89bf-3d2d1af7690e" xlink:to="loc_srt_AverageSalesPrices_caef8a40-d94b-4fe6-8614-610279f0a970" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_78286103-ae4f-4c9c-a651-f17b0f9c9755" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_ffabdb75-4533-42bd-89bf-3d2d1af7690e" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_78286103-ae4f-4c9c-a651-f17b0f9c9755" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_72ec8f52-7b1e-4bdb-a18a-e280cba68725" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_ffabdb75-4533-42bd-89bf-3d2d1af7690e" xlink:to="loc_us-gaap_DerivativeTable_72ec8f52-7b1e-4bdb-a18a-e280cba68725" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_f259719e-1f13-46ac-bf85-02bda599b977" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_72ec8f52-7b1e-4bdb-a18a-e280cba68725" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_f259719e-1f13-46ac-bf85-02bda599b977" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f259719e-1f13-46ac-bf85-02bda599b977_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f259719e-1f13-46ac-bf85-02bda599b977" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f259719e-1f13-46ac-bf85-02bda599b977_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f0409031-3c6a-461b-a8f5-9d5531398479" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_f259719e-1f13-46ac-bf85-02bda599b977" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f0409031-3c6a-461b-a8f5-9d5531398479" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MarketingDerivativesMember_62dcca76-bb7c-44b7-b884-6e178b2fc757" xlink:href="oxy-20230630.xsd#oxy_MarketingDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f0409031-3c6a-461b-a8f5-9d5531398479" xlink:to="loc_oxy_MarketingDerivativesMember_62dcca76-bb7c-44b7-b884-6e178b2fc757" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CrudeOilAndNGLPerBarrelMember_da210cba-1443-4e35-89cd-03ecd9020f19" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CrudeOilAndNGLPerBarrelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f0409031-3c6a-461b-a8f5-9d5531398479" xlink:to="loc_srt_CrudeOilAndNGLPerBarrelMember_da210cba-1443-4e35-89cd-03ecd9020f19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_NaturalGasPerCubicFootMember_339cf748-91ee-498f-aafa-06c4ce2191c7" xlink:href="oxy-20230630.xsd#oxy_NaturalGasPerCubicFootMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f0409031-3c6a-461b-a8f5-9d5531398479" xlink:to="loc_oxy_NaturalGasPerCubicFootMember_339cf748-91ee-498f-aafa-06c4ce2191c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_5bfeb929-2424-4b0f-86cd-aea9314b2b70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_72ec8f52-7b1e-4bdb-a18a-e280cba68725" xlink:to="loc_us-gaap_HedgingDesignationAxis_5bfeb929-2424-4b0f-86cd-aea9314b2b70" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_5bfeb929-2424-4b0f-86cd-aea9314b2b70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_5bfeb929-2424-4b0f-86cd-aea9314b2b70" xlink:to="loc_us-gaap_HedgingDesignationDomain_5bfeb929-2424-4b0f-86cd-aea9314b2b70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_575d599d-51d8-4268-a6ac-93b78df28e46" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_5bfeb929-2424-4b0f-86cd-aea9314b2b70" xlink:to="loc_us-gaap_HedgingDesignationDomain_575d599d-51d8-4268-a6ac-93b78df28e46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_024ca862-680f-4f42-bc41-1eacfc727393" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_575d599d-51d8-4268-a6ac-93b78df28e46" xlink:to="loc_us-gaap_NondesignatedMember_024ca862-680f-4f42-bc41-1eacfc727393" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionAxis_de5d647b-f0c1-4017-aba4-e7e1dd46a9e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PositionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_72ec8f52-7b1e-4bdb-a18a-e280cba68725" xlink:to="loc_us-gaap_PositionAxis_de5d647b-f0c1-4017-aba4-e7e1dd46a9e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_de5d647b-f0c1-4017-aba4-e7e1dd46a9e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PositionAxis_de5d647b-f0c1-4017-aba4-e7e1dd46a9e2" xlink:to="loc_us-gaap_PositionDomain_de5d647b-f0c1-4017-aba4-e7e1dd46a9e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_732b9283-5b58-46a6-8874-61a47ccdfc20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PositionAxis_de5d647b-f0c1-4017-aba4-e7e1dd46a9e2" xlink:to="loc_us-gaap_PositionDomain_732b9283-5b58-46a6-8874-61a47ccdfc20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortMember_73e93625-52a3-4732-8f2b-486cbf9f7a3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShortMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PositionDomain_732b9283-5b58-46a6-8874-61a47ccdfc20" xlink:to="loc_us-gaap_ShortMember_73e93625-52a3-4732-8f2b-486cbf9f7a3e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/DERIVATIVESScheduleofFairValueDerivativesDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#DERIVATIVESScheduleofFairValueDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/DERIVATIVESScheduleofFairValueDerivativesDetails" xlink:type="extended" id="ib32b2db1f42b408280c46a33f9be4d0c_DERIVATIVESScheduleofFairValueDerivativesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_0bbeeec6-9681-4c1e-a8e2-545c30b5d659" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_0bbeeec6-9681-4c1e-a8e2-545c30b5d659" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_438533d2-1e27-4186-b3fe-3606176d1bce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_438533d2-1e27-4186-b3fe-3606176d1bce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_3640a483-5b74-4c73-91a0-60902f71042d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeAssets_3640a483-5b74-4c73-91a0-60902f71042d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_19f195ae-0292-46c9-84b9-19955a965b6b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_19f195ae-0292-46c9-84b9-19955a965b6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset_6db5c9db-02cc-4322-bca9-30f87a08f467" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset_6db5c9db-02cc-4322-bca9-30f87a08f467" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_c2cfc75d-4f16-4bb9-89bc-3bb78f2a4269" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeLiabilities_c2cfc75d-4f16-4bb9-89bc-3bb78f2a4269" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_79b303b0-65a1-4c0a-8078-1b1d1084130a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_79b303b0-65a1-4c0a-8078-1b1d1084130a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_28454c76-1c82-41a4-8839-4dab0d073401" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_28454c76-1c82-41a4-8839-4dab0d073401" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4077f0e7-5411-46d4-a064-01210b193dca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_284f0c7b-292b-43fa-8f3f-89bc7028e87a" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4077f0e7-5411-46d4-a064-01210b193dca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_50ed2878-4cdc-4834-bcfc-ea48078532a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4077f0e7-5411-46d4-a064-01210b193dca" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_50ed2878-4cdc-4834-bcfc-ea48078532a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_50ed2878-4cdc-4834-bcfc-ea48078532a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_50ed2878-4cdc-4834-bcfc-ea48078532a2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_50ed2878-4cdc-4834-bcfc-ea48078532a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bdf7712d-c15a-4907-8472-a02c269bda9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_50ed2878-4cdc-4834-bcfc-ea48078532a2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bdf7712d-c15a-4907-8472-a02c269bda9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_f2c38f8f-332c-4f23-a5a2-e6b210dd89b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bdf7712d-c15a-4907-8472-a02c269bda9a" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_f2c38f8f-332c-4f23-a5a2-e6b210dd89b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_353b32ef-5934-47b6-9040-51eae49796cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bdf7712d-c15a-4907-8472-a02c269bda9a" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_353b32ef-5934-47b6-9040-51eae49796cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_53562878-0fb7-4e9c-846c-3dbbf0854c87" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bdf7712d-c15a-4907-8472-a02c269bda9a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_53562878-0fb7-4e9c-846c-3dbbf0854c87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_ee35cea2-d032-47cd-98aa-5952979ebda2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4077f0e7-5411-46d4-a064-01210b193dca" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_ee35cea2-d032-47cd-98aa-5952979ebda2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_ee35cea2-d032-47cd-98aa-5952979ebda2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ee35cea2-d032-47cd-98aa-5952979ebda2" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ee35cea2-d032-47cd-98aa-5952979ebda2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_4af3d86c-6745-4a4e-bae0-a5dac1179f76" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ee35cea2-d032-47cd-98aa-5952979ebda2" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_4af3d86c-6745-4a4e-bae0-a5dac1179f76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_26d21bb4-bf04-42e9-8750-0342e6f487a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4af3d86c-6745-4a4e-bae0-a5dac1179f76" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_26d21bb4-bf04-42e9-8750-0342e6f487a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LongTermReceivablesAndOtherAssetsNetMember_010e16db-039e-4f57-b4a8-4e06d5bfd8ef" xlink:href="oxy-20230630.xsd#oxy_LongTermReceivablesAndOtherAssetsNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4af3d86c-6745-4a4e-bae0-a5dac1179f76" xlink:to="loc_oxy_LongTermReceivablesAndOtherAssetsNetMember_010e16db-039e-4f57-b4a8-4e06d5bfd8ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesMember_f859a1f8-8d98-4b75-863d-ca4fcf7521bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4af3d86c-6745-4a4e-bae0-a5dac1179f76" xlink:to="loc_us-gaap_AccruedLiabilitiesMember_f859a1f8-8d98-4b75-863d-ca4fcf7521bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_DeferredCreditsAndOtherLiabilitiesMember_6013161b-247c-4f21-bc1c-4f7545c918cc" xlink:href="oxy-20230630.xsd#oxy_DeferredCreditsAndOtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4af3d86c-6745-4a4e-bae0-a5dac1179f76" xlink:to="loc_oxy_DeferredCreditsAndOtherLiabilitiesMember_6013161b-247c-4f21-bc1c-4f7545c918cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_73ca2355-c80a-425b-890e-931786f86877" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_4077f0e7-5411-46d4-a064-01210b193dca" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_73ca2355-c80a-425b-890e-931786f86877" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_73ca2355-c80a-425b-890e-931786f86877_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_73ca2355-c80a-425b-890e-931786f86877" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_73ca2355-c80a-425b-890e-931786f86877_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_d256ac09-a262-412f-814c-4a74b0761c74" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_73ca2355-c80a-425b-890e-931786f86877" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_d256ac09-a262-412f-814c-4a74b0761c74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MarketingDerivativesMember_0719168d-f29c-464b-8336-307cae79fb81" xlink:href="oxy-20230630.xsd#oxy_MarketingDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_d256ac09-a262-412f-814c-4a74b0761c74" xlink:to="loc_oxy_MarketingDerivativesMember_0719168d-f29c-464b-8336-307cae79fb81" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/DERIVATIVESScheduleofGainsandLossesonDerivativesDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#DERIVATIVESScheduleofGainsandLossesonDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/DERIVATIVESScheduleofGainsandLossesonDerivativesDetails" xlink:type="extended" id="ie242bcf9656146559909ee0883ba40ea_DERIVATIVESScheduleofGainsandLossesonDerivativesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1b513d45-1692-4df0-a83e-c69c66c2c56e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_d187f903-568c-4316-a942-ec05bd257e97" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1b513d45-1692-4df0-a83e-c69c66c2c56e" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_d187f903-568c-4316-a942-ec05bd257e97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_73e9fba7-3465-4c4b-8624-a7ba4aebe614" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_1b513d45-1692-4df0-a83e-c69c66c2c56e" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_73e9fba7-3465-4c4b-8624-a7ba4aebe614" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_2e023842-1727-46b3-aa10-a7b198e9edee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_73e9fba7-3465-4c4b-8624-a7ba4aebe614" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_2e023842-1727-46b3-aa10-a7b198e9edee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_2e023842-1727-46b3-aa10-a7b198e9edee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_2e023842-1727-46b3-aa10-a7b198e9edee" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_2e023842-1727-46b3-aa10-a7b198e9edee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_78e06565-acc7-4de8-9a24-75226995c17a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_2e023842-1727-46b3-aa10-a7b198e9edee" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_78e06565-acc7-4de8-9a24-75226995c17a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MarketingDerivativesMember_3eaf37a9-4bf0-434b-9352-e729230359d3" xlink:href="oxy-20230630.xsd#oxy_MarketingDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_78e06565-acc7-4de8-9a24-75226995c17a" xlink:to="loc_oxy_MarketingDerivativesMember_3eaf37a9-4bf0-434b-9352-e729230359d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_beeef415-4c6d-483d-b53e-8f384dfddad7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_78e06565-acc7-4de8-9a24-75226995c17a" xlink:to="loc_us-gaap_InterestRateSwapMember_beeef415-4c6d-483d-b53e-8f384dfddad7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_4ea5a302-5744-4208-8686-be799bb3746a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_73e9fba7-3465-4c4b-8624-a7ba4aebe614" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_4ea5a302-5744-4208-8686-be799bb3746a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_4ea5a302-5744-4208-8686-be799bb3746a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4ea5a302-5744-4208-8686-be799bb3746a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_4ea5a302-5744-4208-8686-be799bb3746a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c535cc5e-fc53-43a8-aa41-f35a34a39bc9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4ea5a302-5744-4208-8686-be799bb3746a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c535cc5e-fc53-43a8-aa41-f35a34a39bc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesMember_807e52fd-6f63-41f8-b48f-c86f5f67d54b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c535cc5e-fc53-43a8-aa41-f35a34a39bc9" xlink:to="loc_us-gaap_SalesMember_807e52fd-6f63-41f8-b48f-c86f5f67d54b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_GainLossOnInterestRateSwapsNetMember_3312a40a-1a78-4ecb-acf3-3fb884c5008d" xlink:href="oxy-20230630.xsd#oxy_GainLossOnInterestRateSwapsNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c535cc5e-fc53-43a8-aa41-f35a34a39bc9" xlink:to="loc_oxy_GainLossOnInterestRateSwapsNetMember_3312a40a-1a78-4ecb-acf3-3fb884c5008d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/DERIVATIVESCreditRiskDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#DERIVATIVESCreditRiskDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/DERIVATIVESCreditRiskDetails" xlink:type="extended" id="ifbc476ce63874470863b89f8c9decf24_DERIVATIVESCreditRiskDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_44a36f92-7d6a-44c1-8e22-bdecdd68521c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_DerivativeNetReceivablePositionAggregateFairValue_46aa1d5a-e787-4b2d-ac8d-7486aa64eae4" xlink:href="oxy-20230630.xsd#oxy_DerivativeNetReceivablePositionAggregateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_44a36f92-7d6a-44c1-8e22-bdecdd68521c" xlink:to="loc_oxy_DerivativeNetReceivablePositionAggregateFairValue_46aa1d5a-e787-4b2d-ac8d-7486aa64eae4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNetLiabilityPositionAggregateFairValue_29d2d8bc-b4ea-41c2-a57c-b99b5c4abd9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNetLiabilityPositionAggregateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_44a36f92-7d6a-44c1-8e22-bdecdd68521c" xlink:to="loc_us-gaap_DerivativeNetLiabilityPositionAggregateFairValue_29d2d8bc-b4ea-41c2-a57c-b99b5c4abd9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_54de5247-aeb0-47b5-84c2-efc647afd427" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_44a36f92-7d6a-44c1-8e22-bdecdd68521c" xlink:to="loc_us-gaap_DerivativeTable_54de5247-aeb0-47b5-84c2-efc647afd427" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_27c915a4-0264-430c-b698-82fb8b2f3ac8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_54de5247-aeb0-47b5-84c2-efc647afd427" xlink:to="loc_us-gaap_HedgingDesignationAxis_27c915a4-0264-430c-b698-82fb8b2f3ac8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_27c915a4-0264-430c-b698-82fb8b2f3ac8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_27c915a4-0264-430c-b698-82fb8b2f3ac8" xlink:to="loc_us-gaap_HedgingDesignationDomain_27c915a4-0264-430c-b698-82fb8b2f3ac8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_2c5d657f-7d0d-47fc-b039-319aaff9e762" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_27c915a4-0264-430c-b698-82fb8b2f3ac8" xlink:to="loc_us-gaap_HedgingDesignationDomain_2c5d657f-7d0d-47fc-b039-319aaff9e762" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_2fdd7a2b-f504-471f-be9a-33b1cf91bad5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_2c5d657f-7d0d-47fc-b039-319aaff9e762" xlink:to="loc_us-gaap_NondesignatedMember_2fdd7a2b-f504-471f-be9a-33b1cf91bad5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/ENVIRONMENTALLIABILITIESANDEXPENDITURESDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#ENVIRONMENTALLIABILITIESANDEXPENDITURESDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/ENVIRONMENTALLIABILITIESANDEXPENDITURESDetails" xlink:type="extended" id="i707f540adb53495f8a05790f3641b1ed_ENVIRONMENTALLIABILITIESANDEXPENDITURESDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SiteContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalRemediationSitesNumber_813641dd-005d-4db1-8773-1915bdfc04cd" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalRemediationSitesNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalRemediationSitesNumber_813641dd-005d-4db1-8773-1915bdfc04cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_4374d22a-92b2-4290-8dbf-434c12deb071" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedEnvironmentalLossContingenciesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_4374d22a-92b2-4290-8dbf-434c12deb071" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumeration_4f75c221-6b72-4af7-bd72-b880407ec880" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_us-gaap_EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumeration_4f75c221-6b72-4af7-bd72-b880407ec880" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_3c0f4523-df32-4a99-8dfa-9cbef48665ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_3c0f4523-df32-4a99-8dfa-9cbef48665ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalRemediationContingencyNumberOfSiteCategories_bb0edf36-c1a6-4540-8385-176b1cdf16fb" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalRemediationContingencyNumberOfSiteCategories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalRemediationContingencyNumberOfSiteCategories_bb0edf36-c1a6-4540-8385-176b1cdf16fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_488e8f70-4f9e-429f-b4b7-292bf000e225" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccrualForEnvironmentalLossContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_488e8f70-4f9e-429f-b4b7-292bf000e225" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalReservesExceedingTenMillionThresholdValueSiteCategory_0c34f87e-ab47-4504-a598-50d7c12308c3" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalReservesExceedingTenMillionThresholdValueSiteCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalReservesExceedingTenMillionThresholdValueSiteCategory_0c34f87e-ab47-4504-a598-50d7c12308c3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalReservesExceedingTenMillionSiteCategoryNumberOfSites_8ce659f0-11ad-41db-9cab-205c1adb21d9" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalReservesExceedingTenMillionSiteCategoryNumberOfSites"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalReservesExceedingTenMillionSiteCategoryNumberOfSites_8ce659f0-11ad-41db-9cab-205c1adb21d9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionSiteCategoryNumberOfSites_902d6ec7-9fb1-46c0-ac06-dd4b18b2613e" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionSiteCategoryNumberOfSites"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionSiteCategoryNumberOfSites_902d6ec7-9fb1-46c0-ac06-dd4b18b2613e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionThresholdValueSiteCategory_fe7d9f5c-ee4c-47e7-925b-3fde89112075" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionThresholdValueSiteCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionThresholdValueSiteCategory_fe7d9f5c-ee4c-47e7-925b-3fde89112075" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PercentOfEnvironmentalReservesToBeFundedInThreeToFourYears_ae9b1305-11b6-4ebf-a5a3-89f9bad98938" xlink:href="oxy-20230630.xsd#oxy_PercentOfEnvironmentalReservesToBeFundedInThreeToFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_PercentOfEnvironmentalReservesToBeFundedInThreeToFourYears_ae9b1305-11b6-4ebf-a5a3-89f9bad98938" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PeriodOfExpendingFirstHalfOfEnvironmentalReserves_0792d6e8-6108-48cb-826a-dc8fc62060af" xlink:href="oxy-20230630.xsd#oxy_PeriodOfExpendingFirstHalfOfEnvironmentalReserves"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_PeriodOfExpendingFirstHalfOfEnvironmentalReserves_0792d6e8-6108-48cb-826a-dc8fc62060af" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PeriodOfExpendingRemainingEnvironmentalReserves_66e7e76a-1135-4473-ba8e-9c538944cc5c" xlink:href="oxy-20230630.xsd#oxy_PeriodOfExpendingRemainingEnvironmentalReserves"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_PeriodOfExpendingRemainingEnvironmentalReserves_66e7e76a-1135-4473-ba8e-9c538944cc5c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalRemediationPossibleAdditionalLossBeyondAccruals_d0fd5c60-892d-4eb4-8763-46380970055c" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalRemediationPossibleAdditionalLossBeyondAccruals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalRemediationPossibleAdditionalLossBeyondAccruals_d0fd5c60-892d-4eb4-8763-46380970055c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_SiteContingencyNumberOfOperatingUnits_07202d4f-483e-4e01-8ce2-3fb0d40cd65f" xlink:href="oxy-20230630.xsd#oxy_SiteContingencyNumberOfOperatingUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_SiteContingencyNumberOfOperatingUnits_07202d4f-483e-4e01-8ce2-3fb0d40cd65f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_RiverStretchWhichRequireRemedialActions_8a43e267-1e7d-4cbf-943a-491bef797bfe" xlink:href="oxy-20230630.xsd#oxy_RiverStretchWhichRequireRemedialActions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_RiverStretchWhichRequireRemedialActions_8a43e267-1e7d-4cbf-943a-491bef797bfe" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_NumberOfPartiesNotifiedToPayTheCost_34656f45-1a41-4574-8e25-2251cb741363" xlink:href="oxy-20230630.xsd#oxy_NumberOfPartiesNotifiedToPayTheCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_NumberOfPartiesNotifiedToPayTheCost_34656f45-1a41-4574-8e25-2251cb741363" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationExpense_5c1d58c4-595f-4c1f-976d-731938f76a7c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_us-gaap_EnvironmentalRemediationExpense_5c1d58c4-595f-4c1f-976d-731938f76a7c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_RiverStretchWhichMayRequireRemedialActions_60af4f43-74c6-40c6-9674-212d8f6c888d" xlink:href="oxy-20230630.xsd#oxy_RiverStretchWhichMayRequireRemedialActions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_RiverStretchWhichMayRequireRemedialActions_60af4f43-74c6-40c6-9674-212d8f6c888d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_NumberOfPartiesSettled_7b154ae1-7976-4763-bece-7b6b47e497d3" xlink:href="oxy-20230630.xsd#oxy_NumberOfPartiesSettled"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_NumberOfPartiesSettled_7b154ae1-7976-4763-bece-7b6b47e497d3" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalRemediationExpensePerformanceImplementationCost_b80d4390-9c95-402d-a0ea-899594ea7ca0" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalRemediationExpensePerformanceImplementationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_oxy_EnvironmentalRemediationExpensePerformanceImplementationCost_b80d4390-9c95-402d-a0ea-899594ea7ca0" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SiteContingencyTable_8c4d600a-7f57-4d71-b26a-55940cdab8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SiteContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SiteContingencyLineItems_198c6348-187a-49c1-b12d-315588031ec8" xlink:to="loc_us-gaap_SiteContingencyTable_8c4d600a-7f57-4d71-b26a-55940cdab8d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteAxis_c31b72ce-3715-4752-88c5-645c81447312" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationSiteAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SiteContingencyTable_8c4d600a-7f57-4d71-b26a-55940cdab8d9" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteAxis_c31b72ce-3715-4752-88c5-645c81447312" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_c31b72ce-3715-4752-88c5-645c81447312_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_c31b72ce-3715-4752-88c5-645c81447312" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_c31b72ce-3715-4752-88c5-645c81447312_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_c31b72ce-3715-4752-88c5-645c81447312" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_NonNationalPrioritiesListSitesMember_5e8c84e6-19af-4c3e-9103-d5d5032a0ebd" xlink:href="oxy-20230630.xsd#oxy_NonNationalPrioritiesListSitesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_NonNationalPrioritiesListSitesMember_5e8c84e6-19af-4c3e-9103-d5d5032a0ebd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_NationalPrioritiesListSitesMember_212ba452-837f-4434-bfb5-f4d972b5d7db" xlink:href="oxy-20230630.xsd#oxy_NationalPrioritiesListSitesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_NationalPrioritiesListSitesMember_212ba452-837f-4434-bfb5-f4d972b5d7db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ThirdPartySitesMember_b946957c-8b2c-4014-b779-2fa042a770a2" xlink:href="oxy-20230630.xsd#oxy_ThirdPartySitesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_ThirdPartySitesMember_b946957c-8b2c-4014-b779-2fa042a770a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EntityOperatedSitesMember_76052b69-09e5-465d-8457-f447ef31c581" xlink:href="oxy-20230630.xsd#oxy_EntityOperatedSitesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_EntityOperatedSitesMember_76052b69-09e5-465d-8457-f447ef31c581" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ClosedOrNonOperatedEntitySitesMember_324c8003-3958-4daa-9532-08685b026de6" xlink:href="oxy-20230630.xsd#oxy_ClosedOrNonOperatedEntitySitesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_ClosedOrNonOperatedEntitySitesMember_324c8003-3958-4daa-9532-08685b026de6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_DiamondAlkaliSuperfundSiteMember_7b012694-92a3-46b6-b24a-b4ff5e30004b" xlink:href="oxy-20230630.xsd#oxy_DiamondAlkaliSuperfundSiteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_DiamondAlkaliSuperfundSiteMember_7b012694-92a3-46b6-b24a-b4ff5e30004b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_DiamondAlkaliSuperfundSiteOperableUnitTwoMember_3ec9c720-7978-4b01-8c58-cbcaa94d9df4" xlink:href="oxy-20230630.xsd#oxy_DiamondAlkaliSuperfundSiteOperableUnitTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_DiamondAlkaliSuperfundSiteOperableUnitTwoMember_3ec9c720-7978-4b01-8c58-cbcaa94d9df4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_DiamondAlkaliSuperfundSiteOperableUnitFourMember_5731d591-93c0-40ba-b2be-8ce19e2498ea" xlink:href="oxy-20230630.xsd#oxy_DiamondAlkaliSuperfundSiteOperableUnitFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_DiamondAlkaliSuperfundSiteOperableUnitFourMember_5731d591-93c0-40ba-b2be-8ce19e2498ea" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_AldenLeedsMember_1d5c065d-399e-4bf5-81d7-4f7abfc80a58" xlink:href="oxy-20230630.xsd#oxy_AldenLeedsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5b45d173-e5c4-4679-8f56-7944f0ed1149" xlink:to="loc_oxy_AldenLeedsMember_1d5c065d-399e-4bf5-81d7-4f7abfc80a58" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b6a5810d-116b-49ff-8876-31464792bbbe" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SiteContingencyTable_8c4d600a-7f57-4d71-b26a-55940cdab8d9" xlink:to="loc_srt_RangeAxis_b6a5810d-116b-49ff-8876-31464792bbbe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b6a5810d-116b-49ff-8876-31464792bbbe_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b6a5810d-116b-49ff-8876-31464792bbbe" xlink:to="loc_srt_RangeMember_b6a5810d-116b-49ff-8876-31464792bbbe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_57584a28-75b8-4b1e-b842-978d5bf58b87" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b6a5810d-116b-49ff-8876-31464792bbbe" xlink:to="loc_srt_RangeMember_57584a28-75b8-4b1e-b842-978d5bf58b87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_e9195aba-d820-4909-a701-659dd30a8293" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_57584a28-75b8-4b1e-b842-978d5bf58b87" xlink:to="loc_srt_MinimumMember_e9195aba-d820-4909-a701-659dd30a8293" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_d3004c55-6b82-4d15-b9f7-13870e6c0808" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_57584a28-75b8-4b1e-b842-978d5bf58b87" xlink:to="loc_srt_MaximumMember_d3004c55-6b82-4d15-b9f7-13870e6c0808" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_ab4ac01d-98d3-4179-b514-967ca33c7aa5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SiteContingencyTable_8c4d600a-7f57-4d71-b26a-55940cdab8d9" xlink:to="loc_srt_LitigationCaseAxis_ab4ac01d-98d3-4179-b514-967ca33c7aa5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_ab4ac01d-98d3-4179-b514-967ca33c7aa5_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_ab4ac01d-98d3-4179-b514-967ca33c7aa5" xlink:to="loc_srt_LitigationCaseTypeDomain_ab4ac01d-98d3-4179-b514-967ca33c7aa5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_6b2d1bc7-b3c3-4a15-84e5-4ca79cc39833" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_ab4ac01d-98d3-4179-b514-967ca33c7aa5" xlink:to="loc_srt_LitigationCaseTypeDomain_6b2d1bc7-b3c3-4a15-84e5-4ca79cc39833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_AldenLeedsMember_4b528e4a-e682-4d2c-9f60-1e2b8633cb1d" xlink:href="oxy-20230630.xsd#oxy_AldenLeedsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_6b2d1bc7-b3c3-4a15-84e5-4ca79cc39833" xlink:to="loc_oxy_AldenLeedsMember_4b528e4a-e682-4d2c-9f60-1e2b8633cb1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_d160092e-6e31-4831-882b-651b0e9968ce" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SiteContingencyTable_8c4d600a-7f57-4d71-b26a-55940cdab8d9" xlink:to="loc_srt_ConsolidatedEntitiesAxis_d160092e-6e31-4831-882b-651b0e9968ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_d160092e-6e31-4831-882b-651b0e9968ce_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_d160092e-6e31-4831-882b-651b0e9968ce" xlink:to="loc_srt_ConsolidatedEntitiesDomain_d160092e-6e31-4831-882b-651b0e9968ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_abf05011-2d1d-422d-a159-09c478ec810b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_d160092e-6e31-4831-882b-651b0e9968ce" xlink:to="loc_srt_ConsolidatedEntitiesDomain_abf05011-2d1d-422d-a159-09c478ec810b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_f0a85a0a-48fa-49c7-8cac-8210cb453e0b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_abf05011-2d1d-422d-a159-09c478ec810b" xlink:to="loc_srt_SubsidiariesMember_f0a85a0a-48fa-49c7-8cac-8210cb453e0b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/LAWSUITSCLAIMSCOMMITMENTSANDCONTINGENCIESDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#LAWSUITSCLAIMSCOMMITMENTSANDCONTINGENCIESDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/LAWSUITSCLAIMSCOMMITMENTSANDCONTINGENCIESDetails" xlink:type="extended" id="i175e7d9aa47641be92a620c798f39d5a_LAWSUITSCLAIMSCOMMITMENTSANDCONTINGENCIESDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermPurchaseCommitmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLegalSettlements_1715d060-5be4-40d6-a93c-9cacd28f1635" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_ProceedsFromLegalSettlements_1715d060-5be4-40d6-a93c-9cacd28f1635" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PercentageOfRecoveryAmountAwardedInSettlementAmount_b4872007-a343-4933-9a09-cb0b5c0f593d" xlink:href="oxy-20230630.xsd#oxy_PercentageOfRecoveryAmountAwardedInSettlementAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_oxy_PercentageOfRecoveryAmountAwardedInSettlementAmount_b4872007-a343-4933-9a09-cb0b5c0f593d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PercentageOfLitigationSettlementClaimed_366751c2-eb1d-44c5-b288-48b5cbc30e67" xlink:href="oxy-20230630.xsd#oxy_PercentageOfLitigationSettlementClaimed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_oxy_PercentageOfLitigationSettlementClaimed_366751c2-eb1d-44c5-b288-48b5cbc30e67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PercentageOfOwnEconomicInterest_e0bf9917-6238-4b86-a67d-7d059e2fad74" xlink:href="oxy-20230630.xsd#oxy_PercentageOfOwnEconomicInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_oxy_PercentageOfOwnEconomicInterest_e0bf9917-6238-4b86-a67d-7d059e2fad74" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_7bfbfc2d-c7ed-4d59-847c-1166f62c9e2c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_7bfbfc2d-c7ed-4d59-847c-1166f62c9e2c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementInterest_0e2503f3-8ad3-4fff-89e2-aa7d3efee037" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LitigationSettlementInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_LitigationSettlementInterest_0e2503f3-8ad3-4fff-89e2-aa7d3efee037" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_NumberOfPartiesSettled_26383f07-58ff-46a2-abac-b4fce4db1fe7" xlink:href="oxy-20230630.xsd#oxy_NumberOfPartiesSettled"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_oxy_NumberOfPartiesSettled_26383f07-58ff-46a2-abac-b4fce4db1fe7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_EnvironmentalRemediationCostsReleased_0a5a5a84-59c8-4105-a7b2-7249442009bf" xlink:href="oxy-20230630.xsd#oxy_EnvironmentalRemediationCostsReleased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_oxy_EnvironmentalRemediationCostsReleased_0a5a5a84-59c8-4105-a7b2-7249442009bf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_eacd1de9-b4b4-41aa-bac8-50e944910130" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LitigationSettlementAmountAwardedFromOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_eacd1de9-b4b4-41aa-bac8-50e944910130" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_3f3c4045-c9fa-483c-b816-d7c17c97df28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossRelatedToLitigationSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_GainLossRelatedToLitigationSettlement_3f3c4045-c9fa-483c-b816-d7c17c97df28" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIncomeTaxRefunds_d85afa96-4fdc-4d95-b4bb-d9bd58b75435" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIncomeTaxRefunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_ProceedsFromIncomeTaxRefunds_d85afa96-4fdc-4d95-b4bb-d9bd58b75435" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLegalSettlements_1bc136c0-691f-4a74-9faf-3f653e1e55f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_PaymentsForLegalSettlements_1bc136c0-691f-4a74-9faf-3f653e1e55f8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LossContingencyPotentialIncomeTaxExpenseBenefit_6e31e65c-4d8e-4c45-9172-c40918fbbb52" xlink:href="oxy-20230630.xsd#oxy_LossContingencyPotentialIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_oxy_LossContingencyPotentialIncomeTaxExpenseBenefit_6e31e65c-4d8e-4c45-9172-c40918fbbb52" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_LossContingencyPotentialIncomeTaxExpenseBenefitAccruedInterest_0c824d42-9d50-43ff-8cd2-30af9db97b6d" xlink:href="oxy-20230630.xsd#oxy_LossContingencyPotentialIncomeTaxExpenseBenefitAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_oxy_LossContingencyPotentialIncomeTaxExpenseBenefitAccruedInterest_0c824d42-9d50-43ff-8cd2-30af9db97b6d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTable_98525bf8-0430-4c73-8b54-77be5bf86f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermPurchaseCommitmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_8251a043-7825-4275-bc5e-3c98dd606dd3" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTable_98525bf8-0430-4c73-8b54-77be5bf86f3e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_b18c2c09-7ee1-442a-b2b9-b28357f78dcd" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_98525bf8-0430-4c73-8b54-77be5bf86f3e" xlink:to="loc_srt_LitigationCaseAxis_b18c2c09-7ee1-442a-b2b9-b28357f78dcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_b18c2c09-7ee1-442a-b2b9-b28357f78dcd_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_b18c2c09-7ee1-442a-b2b9-b28357f78dcd" xlink:to="loc_srt_LitigationCaseTypeDomain_b18c2c09-7ee1-442a-b2b9-b28357f78dcd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_31f75759-4d4b-4f7d-8031-9558bb31b800" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_b18c2c09-7ee1-442a-b2b9-b28357f78dcd" xlink:to="loc_srt_LitigationCaseTypeDomain_31f75759-4d4b-4f7d-8031-9558bb31b800" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ArbitrationDemandFiledByAndesPetroleumEcuadorLtdMember_1cb272c3-3884-4d87-89ae-c28ddbdb1bee" xlink:href="oxy-20230630.xsd#oxy_ArbitrationDemandFiledByAndesPetroleumEcuadorLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_31f75759-4d4b-4f7d-8031-9558bb31b800" xlink:to="loc_oxy_ArbitrationDemandFiledByAndesPetroleumEcuadorLtdMember_1cb272c3-3884-4d87-89ae-c28ddbdb1bee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MaxusFiledBankruptcyMember_516091c6-0173-4df9-9863-e728ceacdc5d" xlink:href="oxy-20230630.xsd#oxy_MaxusFiledBankruptcyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_31f75759-4d4b-4f7d-8031-9558bb31b800" xlink:to="loc_oxy_MaxusFiledBankruptcyMember_516091c6-0173-4df9-9863-e728ceacdc5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_TronoxSettlementMember_e88c58f6-5a12-41a0-93b2-c7acb222bf37" xlink:href="oxy-20230630.xsd#oxy_TronoxSettlementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_31f75759-4d4b-4f7d-8031-9558bb31b800" xlink:to="loc_oxy_TronoxSettlementMember_e88c58f6-5a12-41a0-93b2-c7acb222bf37" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_d925ff5e-8cc7-4b25-b6f8-29f89495a9f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_98525bf8-0430-4c73-8b54-77be5bf86f3e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_d925ff5e-8cc7-4b25-b6f8-29f89495a9f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d925ff5e-8cc7-4b25-b6f8-29f89495a9f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d925ff5e-8cc7-4b25-b6f8-29f89495a9f6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d925ff5e-8cc7-4b25-b6f8-29f89495a9f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_af890cd1-9c15-4360-bd2b-e2aee6df4d89" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d925ff5e-8cc7-4b25-b6f8-29f89495a9f6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_af890cd1-9c15-4360-bd2b-e2aee6df4d89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_AnadarkoPetroleumCorporationMember_f6eea845-3294-4b0e-ac0f-7da5ef372412" xlink:href="oxy-20230630.xsd#oxy_AnadarkoPetroleumCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_af890cd1-9c15-4360-bd2b-e2aee6df4d89" xlink:to="loc_oxy_AnadarkoPetroleumCorporationMember_f6eea845-3294-4b0e-ac0f-7da5ef372412" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_2052204f-d3a6-4160-ac76-5a45f0a2ce1e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_98525bf8-0430-4c73-8b54-77be5bf86f3e" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_2052204f-d3a6-4160-ac76-5a45f0a2ce1e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_2052204f-d3a6-4160-ac76-5a45f0a2ce1e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_2052204f-d3a6-4160-ac76-5a45f0a2ce1e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_2052204f-d3a6-4160-ac76-5a45f0a2ce1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_2857125e-e6cb-425c-9e65-c3fdb5f76826" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_2052204f-d3a6-4160-ac76-5a45f0a2ce1e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_2857125e-e6cb-425c-9e65-c3fdb5f76826" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_a15d9e4d-6e08-41ca-878c-edac624fdf49" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_2857125e-e6cb-425c-9e65-c3fdb5f76826" xlink:to="loc_us-gaap_DomesticCountryMember_a15d9e4d-6e08-41ca-878c-edac624fdf49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_29d3a8c3-8fb8-4dee-a36e-b54bff9509e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_2857125e-e6cb-425c-9e65-c3fdb5f76826" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_29d3a8c3-8fb8-4dee-a36e-b54bff9509e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteAxis_8d724084-22c4-4cbd-a888-2235fd4a3002" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationSiteAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_98525bf8-0430-4c73-8b54-77be5bf86f3e" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteAxis_8d724084-22c4-4cbd-a888-2235fd4a3002" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_8d724084-22c4-4cbd-a888-2235fd4a3002_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_8d724084-22c4-4cbd-a888-2235fd4a3002" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_8d724084-22c4-4cbd-a888-2235fd4a3002_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_5d9467f1-135a-4fc4-852b-0431ce290f07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_8d724084-22c4-4cbd-a888-2235fd4a3002" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_5d9467f1-135a-4fc4-852b-0431ce290f07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_AldenLeedsMember_fc3290d3-4314-4bb0-b2dc-812e67e429a1" xlink:href="oxy-20230630.xsd#oxy_AldenLeedsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_5d9467f1-135a-4fc4-852b-0431ce290f07" xlink:to="loc_oxy_AldenLeedsMember_fc3290d3-4314-4bb0-b2dc-812e67e429a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_fdd55fa3-9b52-46fe-a117-471c414e4444" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_98525bf8-0430-4c73-8b54-77be5bf86f3e" xlink:to="loc_srt_StatementScenarioAxis_fdd55fa3-9b52-46fe-a117-471c414e4444" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_fdd55fa3-9b52-46fe-a117-471c414e4444_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_fdd55fa3-9b52-46fe-a117-471c414e4444" xlink:to="loc_srt_ScenarioUnspecifiedDomain_fdd55fa3-9b52-46fe-a117-471c414e4444_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_e6b5bd98-8f0d-4869-a8ba-41e143a11490" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_fdd55fa3-9b52-46fe-a117-471c414e4444" xlink:to="loc_srt_ScenarioUnspecifiedDomain_e6b5bd98-8f0d-4869-a8ba-41e143a11490" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_184ee9a3-7955-44f1-b077-2bca5581d823" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_e6b5bd98-8f0d-4869-a8ba-41e143a11490" xlink:to="loc_srt_ScenarioForecastMember_184ee9a3-7955-44f1-b077-2bca5581d823" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYNarrativeDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYNarrativeDetails" xlink:type="extended" id="i22cddb18be7d432b985376672fda6ba2_EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_a0a5d04d-5be4-48cc-9cf1-a4f0de583fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_a0a5d04d-5be4-48cc-9cf1-a4f0de583fb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_19be6b6c-ede3-46ea-a5c3-c42bc326f8fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_19be6b6c-ede3-46ea-a5c3-c42bc326f8fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_93432f06-4861-4d42-bfe9-46da6b2a828a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_93432f06-4861-4d42-bfe9-46da6b2a828a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_StockIssuedDuringPeriodValuePerShareAcquisitions_03047029-923f-421f-bce1-32f27a9524e9" xlink:href="oxy-20230630.xsd#oxy_StockIssuedDuringPeriodValuePerShareAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_oxy_StockIssuedDuringPeriodValuePerShareAcquisitions_03047029-923f-421f-bce1-32f27a9524e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_d783987d-c078-40f7-b5b7-ced7df4e101e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_d783987d-c078-40f7-b5b7-ced7df4e101e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PreferredStockLiquidationPreferenceParValuePercentage_6cc551cd-02fc-4bef-a905-d2a2a9c253b7" xlink:href="oxy-20230630.xsd#oxy_PreferredStockLiquidationPreferenceParValuePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_oxy_PreferredStockLiquidationPreferenceParValuePercentage_6cc551cd-02fc-4bef-a905-d2a2a9c253b7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_CommonStockRedemptionThresholdPerShare_aaa5c3c3-35c7-4e57-be9a-b13c54404d0c" xlink:href="oxy-20230630.xsd#oxy_CommonStockRedemptionThresholdPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_oxy_CommonStockRedemptionThresholdPerShare_aaa5c3c3-35c7-4e57-be9a-b13c54404d0c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PreferredStockVoluntaryRedemptionPercentage_cf450c8e-3889-4f1b-a4cf-fa4c27e9220a" xlink:href="oxy-20230630.xsd#oxy_PreferredStockVoluntaryRedemptionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_oxy_PreferredStockVoluntaryRedemptionPercentage_cf450c8e-3889-4f1b-a4cf-fa4c27e9220a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_6af1cec4-4dbe-4b8f-ba14-53f6a0c9eee4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_6af1cec4-4dbe-4b8f-ba14-53f6a0c9eee4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PreferredStockDividendRateForUnpaidAmountsPercentage_b40087e4-35a7-4ec3-859d-d988c29af15f" xlink:href="oxy-20230630.xsd#oxy_PreferredStockDividendRateForUnpaidAmountsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_oxy_PreferredStockDividendRateForUnpaidAmountsPercentage_b40087e4-35a7-4ec3-859d-d988c29af15f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_736b9fce-f017-45a8-b8b6-e0b867f2f572" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_736b9fce-f017-45a8-b8b6-e0b867f2f572" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRedeemedOrCalledDuringPeriodValue_5d94dbab-d231-466f-877a-cf7526647d33" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRedeemedOrCalledDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_StockRedeemedOrCalledDuringPeriodValue_5d94dbab-d231-466f-877a-cf7526647d33" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockRedemptionPremium_2c952efd-59ea-4a23-aa71-4f36bca973bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockRedemptionPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_PreferredStockRedemptionPremium_2c952efd-59ea-4a23-aa71-4f36bca973bd" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_StockRedeemedOrCalledDuringPeriodIncludingPremiumValue_378a07ba-1477-4232-954e-a6b251d7ebaa" xlink:href="oxy-20230630.xsd#oxy_StockRedeemedOrCalledDuringPeriodIncludingPremiumValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_oxy_StockRedeemedOrCalledDuringPeriodIncludingPremiumValue_378a07ba-1477-4232-954e-a6b251d7ebaa" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_72921862-8ced-41a6-bb32-ad9ee8bdce32" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_72921862-8ced-41a6-bb32-ad9ee8bdce32" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValueOutstanding_b3f9f26d-331d-46b6-a36c-77a958d4e52d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_PreferredStockValueOutstanding_b3f9f26d-331d-46b6-a36c-77a958d4e52d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_714e7bde-7445-4c72-8160-c5f16994e3eb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_0f523a97-4903-45a8-9d32-7bf73a0d66ae" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_714e7bde-7445-4c72-8160-c5f16994e3eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_37a821c9-b271-4b63-aaa2-6602c31897c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_714e7bde-7445-4c72-8160-c5f16994e3eb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_37a821c9-b271-4b63-aaa2-6602c31897c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_37a821c9-b271-4b63-aaa2-6602c31897c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_37a821c9-b271-4b63-aaa2-6602c31897c0" xlink:to="loc_us-gaap_EquityComponentDomain_37a821c9-b271-4b63-aaa2-6602c31897c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7af75bda-a348-4812-9e93-5e63842c4cc3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_37a821c9-b271-4b63-aaa2-6602c31897c0" xlink:to="loc_us-gaap_EquityComponentDomain_7af75bda-a348-4812-9e93-5e63842c4cc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_a89b92fb-2c30-40ae-9d62-74397bb1dd07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7af75bda-a348-4812-9e93-5e63842c4cc3" xlink:to="loc_us-gaap_WarrantMember_a89b92fb-2c30-40ae-9d62-74397bb1dd07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_40f05f86-c4b3-4cdb-ba9e-0ca8095b17db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7af75bda-a348-4812-9e93-5e63842c4cc3" xlink:to="loc_us-gaap_PreferredStockMember_40f05f86-c4b3-4cdb-ba9e-0ca8095b17db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8cbe9c61-85b6-4e6f-9884-fedc87a1c518" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_714e7bde-7445-4c72-8160-c5f16994e3eb" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8cbe9c61-85b6-4e6f-9884-fedc87a1c518" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8cbe9c61-85b6-4e6f-9884-fedc87a1c518_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8cbe9c61-85b6-4e6f-9884-fedc87a1c518" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8cbe9c61-85b6-4e6f-9884-fedc87a1c518_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9768c2f2-57c6-4351-827c-da8d79fbf83d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8cbe9c61-85b6-4e6f-9884-fedc87a1c518" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9768c2f2-57c6-4351-827c-da8d79fbf83d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_AnadarkoPetroleumCorporationMember_81867ccd-19d0-4dca-844b-dd4c96a1005c" xlink:href="oxy-20230630.xsd#oxy_AnadarkoPetroleumCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9768c2f2-57c6-4351-827c-da8d79fbf83d" xlink:to="loc_oxy_AnadarkoPetroleumCorporationMember_81867ccd-19d0-4dca-844b-dd4c96a1005c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_dd88b232-54c3-4402-bd0a-bc3999776887" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_714e7bde-7445-4c72-8160-c5f16994e3eb" xlink:to="loc_us-gaap_StatementClassOfStockAxis_dd88b232-54c3-4402-bd0a-bc3999776887" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_dd88b232-54c3-4402-bd0a-bc3999776887_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dd88b232-54c3-4402-bd0a-bc3999776887" xlink:to="loc_us-gaap_ClassOfStockDomain_dd88b232-54c3-4402-bd0a-bc3999776887_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_40079b92-cc4f-48cd-9c56-fe5a29943f23" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dd88b232-54c3-4402-bd0a-bc3999776887" xlink:to="loc_us-gaap_ClassOfStockDomain_40079b92-cc4f-48cd-9c56-fe5a29943f23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_10ad4e4d-5907-4f2a-89d6-59d168860749" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_40079b92-cc4f-48cd-9c56-fe5a29943f23" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_10ad4e4d-5907-4f2a-89d6-59d168860749" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_cd5f421d-dcef-4d61-9ea8-c6c84eb2f4e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_714e7bde-7445-4c72-8160-c5f16994e3eb" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_cd5f421d-dcef-4d61-9ea8-c6c84eb2f4e8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_cd5f421d-dcef-4d61-9ea8-c6c84eb2f4e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_cd5f421d-dcef-4d61-9ea8-c6c84eb2f4e8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_cd5f421d-dcef-4d61-9ea8-c6c84eb2f4e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_39bca5bb-3c85-4039-8152-c9b4dcb46c1e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_cd5f421d-dcef-4d61-9ea8-c6c84eb2f4e8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_39bca5bb-3c85-4039-8152-c9b4dcb46c1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_b40a7d3f-fe4b-4c11-9efc-812ca48f7656" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_39bca5bb-3c85-4039-8152-c9b4dcb46c1e" xlink:to="loc_us-gaap_SubsequentEventMember_b40a7d3f-fe4b-4c11-9efc-812ca48f7656" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYScheduleofRepurchaseAgreementsDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYScheduleofRepurchaseAgreementsDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYScheduleofRepurchaseAgreementsDetails" xlink:type="extended" id="ibf6213a740164618a928b1c1a89e751e_EARNINGSPERSHAREANDSTOCKHOLDERSEQUITYScheduleofRepurchaseAgreementsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_WarrantsAndStockOptionsExercisesInPeriod_4a4eb6c6-bbfe-4816-b82b-f75d8727c080" xlink:href="oxy-20230630.xsd#oxy_WarrantsAndStockOptionsExercisesInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_oxy_WarrantsAndStockOptionsExercisesInPeriod_4a4eb6c6-bbfe-4816-b82b-f75d8727c080" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_9c36c841-f278-4940-a84e-7d71b384062e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_9c36c841-f278-4940-a84e-7d71b384062e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_f728527d-6bfe-4f58-9edf-dc352492726f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_f728527d-6bfe-4f58-9edf-dc352492726f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_0772ba32-f024-42c1-af93-cae44624280e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_0772ba32-f024-42c1-af93-cae44624280e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ProceedsFromWarrantAndStockOptionExercises_88abdf54-0228-4f91-af7e-416cb7408975" xlink:href="oxy-20230630.xsd#oxy_ProceedsFromWarrantAndStockOptionExercises"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_oxy_ProceedsFromWarrantAndStockOptionExercises_88abdf54-0228-4f91-af7e-416cb7408975" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_2837ecab-626c-46c7-9d41-1f8903886e96" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_2837ecab-626c-46c7-9d41-1f8903886e96" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_d3b5dfff-c223-4437-8610-5b26e23b7a67" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_d3b5dfff-c223-4437-8610-5b26e23b7a67" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_ac380bb4-97ff-47d6-a133-e533ae1db142" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_23d6f66d-5249-4fe1-965b-2055e612f69e" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_ac380bb4-97ff-47d6-a133-e533ae1db142" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_91990733-73f0-4d9e-b061-7a5cfb8bd4c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_ac380bb4-97ff-47d6-a133-e533ae1db142" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_91990733-73f0-4d9e-b061-7a5cfb8bd4c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_91990733-73f0-4d9e-b061-7a5cfb8bd4c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_91990733-73f0-4d9e-b061-7a5cfb8bd4c1" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_91990733-73f0-4d9e-b061-7a5cfb8bd4c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_f843978f-66c2-43cc-8219-501c02df4264" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_91990733-73f0-4d9e-b061-7a5cfb8bd4c1" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_f843978f-66c2-43cc-8219-501c02df4264" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_StrikePriceOneMember_b82fd44f-751f-4af5-954c-917aad0df826" xlink:href="oxy-20230630.xsd#oxy_StrikePriceOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_f843978f-66c2-43cc-8219-501c02df4264" xlink:to="loc_oxy_StrikePriceOneMember_b82fd44f-751f-4af5-954c-917aad0df826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_StrikePriceTwoMember_5d0ebc72-7450-4227-aaa8-10dc335ae759" xlink:href="oxy-20230630.xsd#oxy_StrikePriceTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_f843978f-66c2-43cc-8219-501c02df4264" xlink:to="loc_oxy_StrikePriceTwoMember_5d0ebc72-7450-4227-aaa8-10dc335ae759" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.oxy.com/role/SEGMENTSScheduleofIndustrySegmentsandEliminationsDetails" xlink:type="simple" xlink:href="oxy-20230630.xsd#SEGMENTSScheduleofIndustrySegmentsandEliminationsDetails"/>
  <link:definitionLink xlink:role="http://www.oxy.com/role/SEGMENTSScheduleofIndustrySegmentsandEliminationsDetails" xlink:type="extended" id="i7fe882e3c99749c9ad7b1a73db71b3ed_SEGMENTSScheduleofIndustrySegmentsandEliminationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_edbf1be1-7392-45a1-821e-f1f1593691a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_NumberOfOperatingSegments_edbf1be1-7392-45a1-821e-f1f1593691a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_06b01587-72be-4445-9d1c-94ef83e75cd9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_Revenues_06b01587-72be-4445-9d1c-94ef83e75cd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_9d0477cb-3290-4bda-aadf-2a0094dbdfbc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_9d0477cb-3290-4bda-aadf-2a0094dbdfbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_378a24cb-239d-4134-8275-4d7c45e2f253" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_378a24cb-239d-4134-8275-4d7c45e2f253" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d63af812-6fe2-4e6e-b3e2-f422f93110d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_NetIncomeLoss_d63af812-6fe2-4e6e-b3e2-f422f93110d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_5d3ce3f0-8ce5-49f3-a877-790cbf7e4aef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_AssetImpairmentCharges_5d3ce3f0-8ce5-49f3-a877-790cbf7e4aef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_e560945f-a760-4ea1-aa99-98aca946be7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_e560945f-a760-4ea1-aa99-98aca946be7a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_74e15c9a-15c6-4d97-8652-0d6f721c8207" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossRelatedToLitigationSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_GainLossRelatedToLitigationSettlement_74e15c9a-15c6-4d97-8652-0d6f721c8207" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_4366fb7b-09ee-41d9-b032-25a46182aafd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_4366fb7b-09ee-41d9-b032-25a46182aafd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments_db6a436b-5986-4595-adf6-2e0bda97e123" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_GainLossOnInterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstruments_db6a436b-5986-4595-adf6-2e0bda97e123" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_DeferredTaxChargesContractRenewal_20ea9346-3695-4c04-96cb-5e3d34452eee" xlink:href="oxy-20230630.xsd#oxy_DeferredTaxChargesContractRenewal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_oxy_DeferredTaxChargesContractRenewal_20ea9346-3695-4c04-96cb-5e3d34452eee" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_005e2e8c-3163-4019-b917-8d033d82ef68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_005e2e8c-3163-4019-b917-8d033d82ef68" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_NonCashIncomeTaxExpenseBenefitFromReorganization_33bfcc7d-19bc-42ea-9011-f6937f1fa6ef" xlink:href="oxy-20230630.xsd#oxy_NonCashIncomeTaxExpenseBenefitFromReorganization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_oxy_NonCashIncomeTaxExpenseBenefitFromReorganization_33bfcc7d-19bc-42ea-9011-f6937f1fa6ef" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_954ab00b-6551-476d-af60-de30aad88b1b" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_acbe759b-bba0-4b1d-8560-ddf0b601f711" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_srt_ConsolidationItemsAxis_acbe759b-bba0-4b1d-8560-ddf0b601f711" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_acbe759b-bba0-4b1d-8560-ddf0b601f711_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_acbe759b-bba0-4b1d-8560-ddf0b601f711" xlink:to="loc_srt_ConsolidationItemsDomain_acbe759b-bba0-4b1d-8560-ddf0b601f711_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a04d9207-7658-4f77-917c-ed34fe3fdc01" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_acbe759b-bba0-4b1d-8560-ddf0b601f711" xlink:to="loc_srt_ConsolidationItemsDomain_a04d9207-7658-4f77-917c-ed34fe3fdc01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_32841f76-1310-405e-85b2-59a72af53199" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a04d9207-7658-4f77-917c-ed34fe3fdc01" xlink:to="loc_us-gaap_OperatingSegmentsMember_32841f76-1310-405e-85b2-59a72af53199" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_CorporateReconcilingItemsAndEliminationsMember_d3c1331d-8a6f-41d9-b4bd-4a2f5f456ba2" xlink:href="oxy-20230630.xsd#oxy_CorporateReconcilingItemsAndEliminationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a04d9207-7658-4f77-917c-ed34fe3fdc01" xlink:to="loc_oxy_CorporateReconcilingItemsAndEliminationsMember_d3c1331d-8a6f-41d9-b4bd-4a2f5f456ba2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a9f332dd-b643-4807-977a-0f070361cb9e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a9f332dd-b643-4807-977a-0f070361cb9e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a9f332dd-b643-4807-977a-0f070361cb9e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a9f332dd-b643-4807-977a-0f070361cb9e" xlink:to="loc_us-gaap_SegmentDomain_a9f332dd-b643-4807-977a-0f070361cb9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1c00171b-6e04-4b29-b9ba-848a26f6fa46" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a9f332dd-b643-4807-977a-0f070361cb9e" xlink:to="loc_us-gaap_SegmentDomain_1c00171b-6e04-4b29-b9ba-848a26f6fa46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_OilAndGasSegmentMember_324ccebd-4195-47d9-8eb1-49adec225986" xlink:href="oxy-20230630.xsd#oxy_OilAndGasSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1c00171b-6e04-4b29-b9ba-848a26f6fa46" xlink:to="loc_oxy_OilAndGasSegmentMember_324ccebd-4195-47d9-8eb1-49adec225986" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_ChemicalSegmentMember_f24c25ea-97fd-4bb2-8977-1ea0085c40e6" xlink:href="oxy-20230630.xsd#oxy_ChemicalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1c00171b-6e04-4b29-b9ba-848a26f6fa46" xlink:to="loc_oxy_ChemicalSegmentMember_f24c25ea-97fd-4bb2-8977-1ea0085c40e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MidstreamAndMarketingMember_8928cdac-8a1c-44df-b952-9abfb57b9fa6" xlink:href="oxy-20230630.xsd#oxy_MidstreamAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1c00171b-6e04-4b29-b9ba-848a26f6fa46" xlink:to="loc_oxy_MidstreamAndMarketingMember_8928cdac-8a1c-44df-b952-9abfb57b9fa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_7d6b5624-ee84-4f80-9292-e9f040e47c03" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_7d6b5624-ee84-4f80-9292-e9f040e47c03" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_7d6b5624-ee84-4f80-9292-e9f040e47c03_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_7d6b5624-ee84-4f80-9292-e9f040e47c03" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_7d6b5624-ee84-4f80-9292-e9f040e47c03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_a4071c7f-e67b-4db2-93ff-da8fe08720d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_7d6b5624-ee84-4f80-9292-e9f040e47c03" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_a4071c7f-e67b-4db2-93ff-da8fe08720d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_b463ed2b-1ede-4823-9b8b-f8c9d779a91d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_a4071c7f-e67b-4db2-93ff-da8fe08720d8" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_b463ed2b-1ede-4823-9b8b-f8c9d779a91d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b513abae-a9a5-452c-ba00-0140be5c3c4a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b513abae-a9a5-452c-ba00-0140be5c3c4a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b513abae-a9a5-452c-ba00-0140be5c3c4a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b513abae-a9a5-452c-ba00-0140be5c3c4a" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_b513abae-a9a5-452c-ba00-0140be5c3c4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_cce328ce-4446-456f-a3de-7deae5dead5f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_b513abae-a9a5-452c-ba00-0140be5c3c4a" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_cce328ce-4446-456f-a3de-7deae5dead5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_PermianBasinMember_00e21d24-f3fb-402b-9a54-10aef9f7c5f1" xlink:href="oxy-20230630.xsd#oxy_PermianBasinMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_cce328ce-4446-456f-a3de-7deae5dead5f" xlink:to="loc_oxy_PermianBasinMember_00e21d24-f3fb-402b-9a54-10aef9f7c5f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_5f062e1f-9f4d-4a4a-9b78-052a38027542" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_srt_LitigationCaseAxis_5f062e1f-9f4d-4a4a-9b78-052a38027542" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_5f062e1f-9f4d-4a4a-9b78-052a38027542_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_5f062e1f-9f4d-4a4a-9b78-052a38027542" xlink:to="loc_srt_LitigationCaseTypeDomain_5f062e1f-9f4d-4a4a-9b78-052a38027542_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_f7021264-ac4c-471e-aea3-f7cf14884fd3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_5f062e1f-9f4d-4a4a-9b78-052a38027542" xlink:to="loc_srt_LitigationCaseTypeDomain_f7021264-ac4c-471e-aea3-f7cf14884fd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_MaxusFiledBankruptcyMember_cd9f2abf-d709-49e1-85bd-dd73c4a84183" xlink:href="oxy-20230630.xsd#oxy_MaxusFiledBankruptcyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_f7021264-ac4c-471e-aea3-f7cf14884fd3" xlink:to="loc_oxy_MaxusFiledBankruptcyMember_cd9f2abf-d709-49e1-85bd-dd73c4a84183" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_8c5ed57d-5630-44a7-82a3-9ab89c532609" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_8c5ed57d-5630-44a7-82a3-9ab89c532609" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8c5ed57d-5630-44a7-82a3-9ab89c532609_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_8c5ed57d-5630-44a7-82a3-9ab89c532609" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8c5ed57d-5630-44a7-82a3-9ab89c532609_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ac2c23c9-4d0f-4b0d-b26d-c081106cb2d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_8c5ed57d-5630-44a7-82a3-9ab89c532609" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ac2c23c9-4d0f-4b0d-b26d-c081106cb2d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_85598cc0-0af3-4405-82f7-4d02509b9d05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ac2c23c9-4d0f-4b0d-b26d-c081106cb2d4" xlink:to="loc_us-gaap_LandMember_85598cc0-0af3-4405-82f7-4d02509b9d05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssetAxis_f03dc05f-b8cb-42fc-ae8d-a10fd0dc6057" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RegulatoryAssetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_us-gaap_RegulatoryAssetAxis_f03dc05f-b8cb-42fc-ae8d-a10fd0dc6057" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssetDomain_f03dc05f-b8cb-42fc-ae8d-a10fd0dc6057_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RegulatoryAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RegulatoryAssetAxis_f03dc05f-b8cb-42fc-ae8d-a10fd0dc6057" xlink:to="loc_us-gaap_RegulatoryAssetDomain_f03dc05f-b8cb-42fc-ae8d-a10fd0dc6057_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssetDomain_77063c6e-2de6-43d8-9053-283fc450302a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RegulatoryAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RegulatoryAssetAxis_f03dc05f-b8cb-42fc-ae8d-a10fd0dc6057" xlink:to="loc_us-gaap_RegulatoryAssetDomain_77063c6e-2de6-43d8-9053-283fc450302a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxChargesMember_7f4f241b-a55e-4a74-a907-74059f717dca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxChargesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetDomain_77063c6e-2de6-43d8-9053-283fc450302a" xlink:to="loc_us-gaap_DeferredIncomeTaxChargesMember_7f4f241b-a55e-4a74-a907-74059f717dca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_632eb15a-4e5c-46b3-a68d-0ae4bca8baac" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_10a7e9e0-86a6-4eb7-99c7-549c76568579" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_632eb15a-4e5c-46b3-a68d-0ae4bca8baac" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_632eb15a-4e5c-46b3-a68d-0ae4bca8baac_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_632eb15a-4e5c-46b3-a68d-0ae4bca8baac" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_632eb15a-4e5c-46b3-a68d-0ae4bca8baac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_5696a885-b97e-4ccf-b860-fa21857cccd5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_632eb15a-4e5c-46b3-a68d-0ae4bca8baac" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_5696a885-b97e-4ccf-b860-fa21857cccd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_oxy_BlackButteCoalCompanyMember_b4ab2d74-e75c-434f-a248-7c1c1881d2d4" xlink:href="oxy-20230630.xsd#oxy_BlackButteCoalCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_5696a885-b97e-4ccf-b860-fa21857cccd5" xlink:to="loc_oxy_BlackButteCoalCompanyMember_b4ab2d74-e75c-434f-a248-7c1c1881d2d4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-roles-2023.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
