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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a0a50c-a19c-7648-ac6b-039e5d9a51b3,g:a5879161-0a64-4c6c-80b7-1ecfad954783-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:ck0000932782="http://mexicopetroleum.com/20251231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://mexicopetroleum.com/20251231">
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/rxp/2026" schemaLocation="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/snj/2026" schemaLocation="https://xbrl.sec.gov/snj/2026/snj-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link: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">
        <link:roleRef roleURI="http://xbrl.sec.gov/rxp/role/ByGovernment" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#ByGovernment"/>
        <link:presentationLink xlink:role="http://xbrl.sec.gov/rxp/role/ByGovernment" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_country_AllCountriesDomain" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_AllCountriesDomain"/>
          <link:loc xlink:type="locator" xlink:label="loc_country_MX" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_MX"/>
          <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_country_AllCountriesDomain" xlink:to="loc_country_MX" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_rxp_AllGovernmentsMember" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#rxp_AllGovernmentsMember"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanGovernmentMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanGovernmentMember"/>
          <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllGovernmentsMember" xlink:to="loc_ck0000932782_MexicanGovernmentMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
        </link:presentationLink>
        <link:roleRef roleURI="http://xbrl.sec.gov/rxp/role/ByProject" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#ByProject"/>
        <link:presentationLink xlink:role="http://xbrl.sec.gov/rxp/role/ByProject" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_rxp_AllProjectsMember" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#rxp_AllProjectsMember"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_EntityLevelPaymentMXMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_EntityLevelPaymentMXMember"/>
          <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_EntityLevelPaymentMXMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MutualBenefitProjectsMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MutualBenefitProjectsMember"/>
          <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_MutualBenefitProjectsMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHA3CARDENASMORA2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHA3CARDENASMORA2018Member"/>
          <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHA3CARDENASMORA2018Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHA4OGARRIO2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHA4OGARRIO2018Member"/>
          <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHA4OGARRIO2018Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM1EKBALAM2017Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM1EKBALAM2017Member"/>
          <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM1EKBALAM2017Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM2SANTUARIOELGOLPE2017Member"/>
          <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM3MISION2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM3MISION2018Member"/>
          <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM3MISION2018Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM4EBANO2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM4EBANO2018Member"/>
          <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM4EBANO2018Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM5MIQUETLA2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM5MIQUETLA2018Member"/>
          <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM5MIQUETLA2018Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMiningProjectMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMiningProjectMember"/>
          <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_PhosphateMiningProjectMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMiningProject2Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMiningProject2Member"/>
          <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_PhosphateMiningProject2Member" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
        </link:presentationLink>
        <link:roleRef roleURI="http://xbrl.sec.gov/rxp/role/ByCategory" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#ByCategory"/>
        <link:presentationLink xlink:role="http://xbrl.sec.gov/rxp/role/ByCategory" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanPetroleumExplorationAndProductionMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanPetroleumExplorationAndProductionMember"/>
          <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain" xlink:to="loc_ck0000932782_MexicanPetroleumExplorationAndProductionMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember"/>
          <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityDomain" xlink:to="loc_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/label"/>
        </link:presentationLink>
        <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://xbrl.sec.gov/rxp/role/GovernmentsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#GovernmentsOnly"/>
        <link:definitionLink xlink:role="http://xbrl.sec.gov/rxp/role/GovernmentsOnly" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_rxp_AllGovernmentsMember" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#rxp_AllGovernmentsMember"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanGovernmentMember_01a0a53e-5a62-7f1f-938b-c089ac6417ad" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanGovernmentMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllGovernmentsMember" xlink:to="loc_ck0000932782_MexicanGovernmentMember_01a0a53e-5a62-7f1f-938b-c089ac6417ad" xlink:type="arc" order="1"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember_01a0a541-1239-7422-8e3f-f780ed3b4462" xlink:href="ck0000932782-20251231.xsd#ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllGovernmentsMember" xlink:to="loc_ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember_01a0a541-1239-7422-8e3f-f780ed3b4462" xlink:type="arc" order="2"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_StateOfTabascoMember_01a0a541-5bbb-73e0-b957-124a6bab6fb9" xlink:href="ck0000932782-20251231.xsd#ck0000932782_StateOfTabascoMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllGovernmentsMember" xlink:to="loc_ck0000932782_StateOfTabascoMember_01a0a541-5bbb-73e0-b957-124a6bab6fb9" xlink:type="arc" order="3"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_ComisionNacionalDeHidrocarburosMember_01a0a541-a16f-75c9-bc04-ddc75c493320" xlink:href="ck0000932782-20251231.xsd#ck0000932782_ComisionNacionalDeHidrocarburosMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllGovernmentsMember" xlink:to="loc_ck0000932782_ComisionNacionalDeHidrocarburosMember_01a0a541-a16f-75c9-bc04-ddc75c493320" xlink:type="arc" order="4"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_ServicioGeologicoMexicanoMember_01a0a543-1b15-77ee-9671-61ef4eeed44f" xlink:href="ck0000932782-20251231.xsd#ck0000932782_ServicioGeologicoMexicanoMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllGovernmentsMember" xlink:to="loc_ck0000932782_ServicioGeologicoMexicanoMember_01a0a543-1b15-77ee-9671-61ef4eeed44f" xlink:type="arc" order="5"/>
        </link:definitionLink>
        <link:roleRef roleURI="http://xbrl.sec.gov/rxp/role/ProjectsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#ProjectsOnly"/>
        <link:definitionLink xlink:role="http://xbrl.sec.gov/rxp/role/ProjectsOnly" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_rxp_AllProjectsMember" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#rxp_AllProjectsMember"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_EntityLevelPaymentMXMember_01a0a514-ffab-748a-b6e4-63f46839bf32" xlink:href="ck0000932782-20251231.xsd#ck0000932782_EntityLevelPaymentMXMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_EntityLevelPaymentMXMember_01a0a514-ffab-748a-b6e4-63f46839bf32" xlink:type="arc" order="1"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MutualBenefitProjectsMember_01a0a515-56fb-768d-b2ff-9976e05caac7" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MutualBenefitProjectsMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_MutualBenefitProjectsMember_01a0a515-56fb-768d-b2ff-9976e05caac7" xlink:type="arc" order="2"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHA3CARDENASMORA2018Member_01a0a515-cd13-775b-9e2f-a37f7300c2be" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHA3CARDENASMORA2018Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHA3CARDENASMORA2018Member_01a0a515-cd13-775b-9e2f-a37f7300c2be" xlink:type="arc" order="3"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHA4OGARRIO2018Member_01a0a516-0e78-73d8-a47b-d8bd61651b04" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHA4OGARRIO2018Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHA4OGARRIO2018Member_01a0a516-0e78-73d8-a47b-d8bd61651b04" xlink:type="arc" order="4"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM1EKBALAM2017Member_01a0a516-47dc-7611-b12b-4db869786670" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM1EKBALAM2017Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM1EKBALAM2017Member_01a0a516-47dc-7611-b12b-4db869786670" xlink:type="arc" order="5"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member_01a0a539-05c3-7d23-81d3-453e725cf7ec" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM2SANTUARIOELGOLPE2017Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member_01a0a539-05c3-7d23-81d3-453e725cf7ec" xlink:type="arc" order="6"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM3MISION2018Member_01a0a539-45ac-7649-9757-7fb0ee138009" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM3MISION2018Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM3MISION2018Member_01a0a539-45ac-7649-9757-7fb0ee138009" xlink:type="arc" order="7"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM4EBANO2018Member_01a0a539-82d0-7a82-89de-b953745ba94d" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM4EBANO2018Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM4EBANO2018Member_01a0a539-82d0-7a82-89de-b953745ba94d" xlink:type="arc" order="8"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM5MIQUETLA2018Member_01a0a539-b68b-718c-a0ee-fdcf5235c396" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM5MIQUETLA2018Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_CNHM5MIQUETLA2018Member_01a0a539-b68b-718c-a0ee-fdcf5235c396" xlink:type="arc" order="9"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMiningProjectMember_01a0ceaa-db20-79fe-8895-20ad284046d0" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMiningProjectMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_PhosphateMiningProjectMember_01a0ceaa-db20-79fe-8895-20ad284046d0" xlink:type="arc" order="10"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMiningProject2Member_01a0ceab-27a1-72b8-8500-03516e802f06" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMiningProject2Member"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_PhosphateMiningProject2Member_01a0ceab-27a1-72b8-8500-03516e802f06" xlink:type="arc" order="11"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PHOSPHATEMININGMember_01a0a543-5870-7515-b043-1eedd1bb3b2b" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PHOSPHATEMININGMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllProjectsMember" xlink:to="loc_ck0000932782_PHOSPHATEMININGMember_01a0a543-5870-7515-b043-1eedd1bb3b2b" xlink:type="arc" order="12"/>
        </link:definitionLink>
        <link:roleRef roleURI="http://xbrl.sec.gov/rxp/role/EntitiesOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#EntitiesOnly"/>
        <link:definitionLink xlink:role="http://xbrl.sec.gov/rxp/role/EntitiesOnly" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanPetroleumExplorationAndProductionMember_01a0ce9e-457a-7dc3-87f9-3459c8b72489" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanPetroleumExplorationAndProductionMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain" xlink:to="loc_ck0000932782_MexicanPetroleumExplorationAndProductionMember_01a0ce9e-457a-7dc3-87f9-3459c8b72489" xlink:type="arc" order="1"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember_01a0cea6-2c4c-76fb-bc5e-fade741b8c78" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain" xlink:to="loc_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember_01a0cea6-2c4c-76fb-bc5e-fade741b8c78" xlink:type="arc" order="2"/>
        </link:definitionLink>
        <link:roleRef roleURI="http://xbrl.sec.gov/rxp/role/ResourcesOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#ResourcesOnly"/>
        <link:definitionLink xlink:role="http://xbrl.sec.gov/rxp/role/ResourcesOnly" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_rxp_AllResourcesMember" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#rxp_AllResourcesMember"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_OilAndNaturalGasMember_01a0aa7d-543a-7fca-985a-08c84c58fb28" xlink:href="ck0000932782-20251231.xsd#ck0000932782_OilAndNaturalGasMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllResourcesMember" xlink:to="loc_ck0000932782_OilAndNaturalGasMember_01a0aa7d-543a-7fca-985a-08c84c58fb28" xlink:type="arc" order="1"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_NaturalGasMember_01a0ce6f-9c23-7b1a-aa24-ebd9b7aeb36f" xlink:href="ck0000932782-20251231.xsd#ck0000932782_NaturalGasMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllResourcesMember" xlink:to="loc_ck0000932782_NaturalGasMember_01a0ce6f-9c23-7b1a-aa24-ebd9b7aeb36f" xlink:type="arc" order="2"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMember_01a0ce70-1495-7ded-8b56-fc0d68af2ee5" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllResourcesMember" xlink:to="loc_ck0000932782_PhosphateMember_01a0ce70-1495-7ded-8b56-fc0d68af2ee5" xlink:type="arc" order="3"/>
        </link:definitionLink>
        <link:roleRef roleURI="http://xbrl.sec.gov/rxp/role/SegmentsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#SegmentsOnly"/>
        <link:definitionLink xlink:role="http://xbrl.sec.gov/rxp/role/SegmentsOnly" xlink:type="extended">
          <link:loc xlink:type="locator" xlink:label="loc_rxp_AllSegmentsMember" xlink:href="https://xbrl.sec.gov/rxp/2026/rxp-2026.xsd#rxp_AllSegmentsMember"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PemexExplorationAndProductionPEPMember_01a0a53a-755d-755f-bf15-6d38c099d2da" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PemexExplorationAndProductionPEPMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllSegmentsMember" xlink:to="loc_ck0000932782_PemexExplorationAndProductionPEPMember_01a0a53a-755d-755f-bf15-6d38c099d2da" xlink:type="arc" order="1"/>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_OtherOperatingSubsidiaryCompaniesMember_01a0a53f-f3f2-7807-b141-637f8f3aae74" xlink:href="ck0000932782-20251231.xsd#ck0000932782_OtherOperatingSubsidiaryCompaniesMember"/>
          <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rxp_AllSegmentsMember" xlink:to="loc_ck0000932782_OtherOperatingSubsidiaryCompaniesMember_01a0a53f-f3f2-7807-b141-637f8f3aae74" xlink:type="arc" order="2"/>
        </link:definitionLink>
        <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
        <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
        <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel"/>
        <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
        <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
        <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
        <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
        <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
          <link:label id="lab_ck0000932782_CNHM1EKBALAM2017Member_label_en-US" xlink:label="lab_ck0000932782_CNHM1EKBALAM2017Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CNH-M1-EK-BALAM/2017 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM1EKBALAM2017Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM1EKBALAM2017Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_CNHM1EKBALAM2017Member" xlink:to="lab_ck0000932782_CNHM1EKBALAM2017Member" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_EntityLevelPaymentMXMember_label_en-US" xlink:label="lab_ck0000932782_EntityLevelPaymentMXMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Level Payment/MX [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_EntityLevelPaymentMXMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_EntityLevelPaymentMXMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_EntityLevelPaymentMXMember" xlink:to="lab_ck0000932782_EntityLevelPaymentMXMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_PhosphateMiningProjectMember_label_en-US" xlink:label="lab_ck0000932782_PhosphateMiningProjectMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Phosphate Mining Project [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMiningProjectMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMiningProjectMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_PhosphateMiningProjectMember" xlink:to="lab_ck0000932782_PhosphateMiningProjectMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember_label_en-US" xlink:label="lab_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mexican Petroleum Other Operating Subsidiary Companies [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" xlink:to="lab_ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_MexicanPetroleumExplorationAndProductionMember_label_en-US" xlink:label="lab_ck0000932782_MexicanPetroleumExplorationAndProductionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mexican Petroleum Exploration and Production [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanPetroleumExplorationAndProductionMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanPetroleumExplorationAndProductionMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_MexicanPetroleumExplorationAndProductionMember" xlink:to="lab_ck0000932782_MexicanPetroleumExplorationAndProductionMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_PhosphateMiningProject2Member_label_en-US" xlink:label="lab_ck0000932782_PhosphateMiningProject2Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Phosphate Mining Project 2 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMiningProject2Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMiningProject2Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_PhosphateMiningProject2Member" xlink:to="lab_ck0000932782_PhosphateMiningProject2Member" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_CNHM4EBANO2018Member_label_en-US" xlink:label="lab_ck0000932782_CNHM4EBANO2018Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CNH-M4-&#201;BANO/2018 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM4EBANO2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM4EBANO2018Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_CNHM4EBANO2018Member" xlink:to="lab_ck0000932782_CNHM4EBANO2018Member" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_CNHA4OGARRIO2018Member_label_en-US" xlink:label="lab_ck0000932782_CNHA4OGARRIO2018Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CNH-A4-OGARRIO/2018 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHA4OGARRIO2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHA4OGARRIO2018Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_CNHA4OGARRIO2018Member" xlink:to="lab_ck0000932782_CNHA4OGARRIO2018Member" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_MutualBenefitProjectsMember_label_en-US" xlink:label="lab_ck0000932782_MutualBenefitProjectsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mutual Benefit Projects [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MutualBenefitProjectsMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MutualBenefitProjectsMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_MutualBenefitProjectsMember" xlink:to="lab_ck0000932782_MutualBenefitProjectsMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_MexicanGovernmentMember_label_en-US" xlink:label="lab_ck0000932782_MexicanGovernmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mexican Government [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_MexicanGovernmentMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_MexicanGovernmentMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_MexicanGovernmentMember" xlink:to="lab_ck0000932782_MexicanGovernmentMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_CNHM3MISION2018Member_label_en-US" xlink:label="lab_ck0000932782_CNHM3MISION2018Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CNH-M3-MISI&#211;N/2018 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM3MISION2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM3MISION2018Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_CNHM3MISION2018Member" xlink:to="lab_ck0000932782_CNHM3MISION2018Member" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member_label_en-US" xlink:label="lab_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CNH-M2-SANTUARIO-EL GOLPE/2017 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM2SANTUARIOELGOLPE2017Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member" xlink:to="lab_ck0000932782_CNHM2SANTUARIOELGOLPE2017Member" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_CNHM5MIQUETLA2018Member_label_en-US" xlink:label="lab_ck0000932782_CNHM5MIQUETLA2018Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CNH-M5-MIQUETLA/2018 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHM5MIQUETLA2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHM5MIQUETLA2018Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_CNHM5MIQUETLA2018Member" xlink:to="lab_ck0000932782_CNHM5MIQUETLA2018Member" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_CNHA3CARDENASMORA2018Member_label_en-US" xlink:label="lab_ck0000932782_CNHA3CARDENASMORA2018Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CNH-A3-C&#193;RDENAS-MORA/2018 [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_CNHA3CARDENASMORA2018Member" xlink:href="ck0000932782-20251231.xsd#ck0000932782_CNHA3CARDENASMORA2018Member"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_CNHA3CARDENASMORA2018Member" xlink:to="lab_ck0000932782_CNHA3CARDENASMORA2018Member" xlink:type="arc" order="1"/>
          <link:label id="lab_country_MX_label_en-US" xlink:label="lab_country_MX" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MEXICO</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_country_MX" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_MX"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_country_MX" xlink:to="lab_country_MX" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember_label_en-US" xlink:label="lab_ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secretar&#237;a de Hacienda y Cr&#233;dito P&#250;blico [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember" xlink:to="lab_ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_OilAndNaturalGasMember_label_en-US" xlink:label="lab_ck0000932782_OilAndNaturalGasMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil and Natural Gas [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_OilAndNaturalGasMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_OilAndNaturalGasMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_OilAndNaturalGasMember" xlink:to="lab_ck0000932782_OilAndNaturalGasMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_PemexExplorationAndProductionPEPMember_label_en-US" xlink:label="lab_ck0000932782_PemexExplorationAndProductionPEPMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pemex Exploration and Production (PEP) [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PemexExplorationAndProductionPEPMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PemexExplorationAndProductionPEPMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_PemexExplorationAndProductionPEPMember" xlink:to="lab_ck0000932782_PemexExplorationAndProductionPEPMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_StateOfTabascoMember_label_en-US" xlink:label="lab_ck0000932782_StateOfTabascoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">State of Tabasco [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_StateOfTabascoMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_StateOfTabascoMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_StateOfTabascoMember" xlink:to="lab_ck0000932782_StateOfTabascoMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_ComisionNacionalDeHidrocarburosMember_label_en-US" xlink:label="lab_ck0000932782_ComisionNacionalDeHidrocarburosMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comisi&#243;n Nacional de Hidrocarburos [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_ComisionNacionalDeHidrocarburosMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_ComisionNacionalDeHidrocarburosMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_ComisionNacionalDeHidrocarburosMember" xlink:to="lab_ck0000932782_ComisionNacionalDeHidrocarburosMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_NaturalGasMember_label_en-US" xlink:label="lab_ck0000932782_NaturalGasMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Natural Gas [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_NaturalGasMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_NaturalGasMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_NaturalGasMember" xlink:to="lab_ck0000932782_NaturalGasMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_PHOSPHATEMININGMember_label_en-US" xlink:label="lab_ck0000932782_PHOSPHATEMININGMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PHOSPHATE MINING [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PHOSPHATEMININGMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PHOSPHATEMININGMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_PHOSPHATEMININGMember" xlink:to="lab_ck0000932782_PHOSPHATEMININGMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_PhosphateMember_label_en-US" xlink:label="lab_ck0000932782_PhosphateMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Phosphate [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_PhosphateMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_PhosphateMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_PhosphateMember" xlink:to="lab_ck0000932782_PhosphateMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_OtherOperatingSubsidiaryCompaniesMember_label_en-US" xlink:label="lab_ck0000932782_OtherOperatingSubsidiaryCompaniesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Operating Subsidiary Companies [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_OtherOperatingSubsidiaryCompaniesMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_OtherOperatingSubsidiaryCompaniesMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_OtherOperatingSubsidiaryCompaniesMember" xlink:to="lab_ck0000932782_OtherOperatingSubsidiaryCompaniesMember" xlink:type="arc" order="1"/>
          <link:label id="lab_ck0000932782_ServicioGeologicoMexicanoMember_label_en-US" xlink:label="lab_ck0000932782_ServicioGeologicoMexicanoMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicio Geol&#243;gico Mexicano [Member]</link:label>
          <link:loc xlink:type="locator" xlink:label="loc_ck0000932782_ServicioGeologicoMexicanoMember" xlink:href="ck0000932782-20251231.xsd#ck0000932782_ServicioGeologicoMexicanoMember"/>
          <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0000932782_ServicioGeologicoMexicanoMember" xlink:to="lab_ck0000932782_ServicioGeologicoMexicanoMember" xlink:type="arc" order="1"/>
        </link:labelLink>
      </link:linkbase>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="ck0000932782_MexicanGovernmentMember" abstract="true" name="MexicanGovernmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_EntityLevelPaymentMXMember" abstract="true" name="EntityLevelPaymentMXMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_MutualBenefitProjectsMember" abstract="true" name="MutualBenefitProjectsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_CNHA3CARDENASMORA2018Member" abstract="true" name="CNHA3CARDENASMORA2018Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_CNHA4OGARRIO2018Member" abstract="true" name="CNHA4OGARRIO2018Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_CNHM1EKBALAM2017Member" abstract="true" name="CNHM1EKBALAM2017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_CNHM2SANTUARIOELGOLPE2017Member" abstract="true" name="CNHM2SANTUARIOELGOLPE2017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_CNHM3MISION2018Member" abstract="true" name="CNHM3MISION2018Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_CNHM4EBANO2018Member" abstract="true" name="CNHM4EBANO2018Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_CNHM5MIQUETLA2018Member" abstract="true" name="CNHM5MIQUETLA2018Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_MexicanPetroleumExplorationAndProductionMember" abstract="true" name="MexicanPetroleumExplorationAndProductionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_PhosphateMiningProjectMember" abstract="true" name="PhosphateMiningProjectMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_PhosphateMiningProject2Member" abstract="true" name="PhosphateMiningProject2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" abstract="true" name="MexicanPetroleumOtherOperatingSubsidiaryCompaniesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_SecretariaDeHaciendaYCreditoPublicoMember" abstract="true" name="SecretariaDeHaciendaYCreditoPublicoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_OilAndNaturalGasMember" abstract="true" name="OilAndNaturalGasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_PemexExplorationAndProductionPEPMember" abstract="true" name="PemexExplorationAndProductionPEPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_StateOfTabascoMember" abstract="true" name="StateOfTabascoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_ComisionNacionalDeHidrocarburosMember" abstract="true" name="ComisionNacionalDeHidrocarburosMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_NaturalGasMember" abstract="true" name="NaturalGasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_PHOSPHATEMININGMember" abstract="true" name="PHOSPHATEMININGMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_PhosphateMember" abstract="true" name="PhosphateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_OtherOperatingSubsidiaryCompaniesMember" abstract="true" name="OtherOperatingSubsidiaryCompaniesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0000932782_ServicioGeologicoMexicanoMember" abstract="true" name="ServicioGeologicoMexicanoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
