<?xml version="1.0" encoding="UTF-8"?>
<edgarSubmission xmlns:com="http://www.sec.gov/edgar/common" xmlns="http://www.sec.gov/edgar/ncen">
  <schemaVersion>X0505</schemaVersion>
  <headerData>
    <submissionType>N-CEN</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <filer>
        <issuerCredentials>
          <cik>0000856943</cik>
          <ccc>XXXXXXXX</ccc>
        </issuerCredentials>
      </filer>
      <flags>
        <overrideInternetFlag>false</overrideInternetFlag>
        <confirmingCopyFlag>false</confirmingCopyFlag>
      </flags>
      <investmentCompanyType>N-4</investmentCompanyType>
    </filerInfo>
    <seriesClass>
      <reportClass>
        <rptIncludeAllClassesFlag>true</rptIncludeAllClassesFlag>
      </reportClass>
    </seriesClass>
  </headerData>
  <formData>
    <generalInfo reportEndingPeriod="2025-12-31" isReportPeriodLt12="N"/>
    <registrantInfo>
      <registrantFullName>Guardian Separate Account D</registrantFullName>
      <investmentCompFileNo>811-05880</investmentCompFileNo>
      <registrantCik>0000856943</registrantCik>
      <registrantLei>549300LIVC0VWZL69106</registrantLei>
      <registrantstreet1>10 Hudson Yards</registrantstreet1>
      <registrantcity>New York </registrantcity>
      <registrantzipCode>10001</registrantzipCode>
      <registrantstate>US-NY</registrantstate>
      <registrantcountry>US</registrantcountry>
      <registrantphoneNumber>2125988827</registrantphoneNumber>
      <websites>
        <website webpage="https://www.guardianlife.com/"/>
      </websites>
      <locationBooksRecords>
        <locationBooksRecord>
          <officeName>Frank Heffernan</officeName>
          <officeAddress1>6255 Sterners Way</officeAddress1>
          <officeCity>Bethlehem</officeCity>
          <officeStateCountry officeState="US-PA" officeCountry="US"/>
          <officeRecordsZipCode>18017</officeRecordsZipCode>
          <officePhone>6103931529</officePhone>
          <booksRecordsDesc>Audited Financial Statements, 24F2 and NCEN filings</booksRecordsDesc>
        </locationBooksRecord>
        <locationBooksRecord>
          <officeName>James Scott</officeName>
          <officeAddress1>6255 Sterners Way</officeAddress1>
          <officeCity>Bethlehem</officeCity>
          <officeStateCountry officeState="US-PA" officeCountry="US"/>
          <officeRecordsZipCode>18017</officeRecordsZipCode>
          <officePhone>6108077466</officePhone>
          <booksRecordsDesc>Daily Trading Records, Annuity and Life Monthly Records</booksRecordsDesc>
        </locationBooksRecord>
      </locationBooksRecords>
      <isRegistrantFirstFiling>N</isRegistrantFirstFiling>
      <isRegistrantLastFiling>N</isRegistrantLastFiling>
      <isRegistrantFamilyInvComp>N</isRegistrantFamilyInvComp>
      <registrantClassificationType>N-4</registrantClassificationType>
      <isSecuritiesActRegistration>Y</isSecuritiesActRegistration>
      <chiefComplianceOfficers>
        <chiefComplianceOfficer>
          <ccoName>Jeff Butscher</ccoName>
          <crdNumber>000046173</crdNumber>
          <ccoStreet1>6255 Sterner's Way</ccoStreet1>
          <ccoCity>Bethlehem</ccoCity>
          <ccoStateCountry ccoState="US-PA" ccoCountry="US"/>
          <ccoZipCode>18017</ccoZipCode>
          <ccoPhone>XXXXXX</ccoPhone>
          <isCcoChangedSinceLastFiling>N</isCcoChangedSinceLastFiling>
          <ccoEmployers>
            <ccoEmployer ccoEmployerName="N/A" ccoEmployerId="N/A"/>
          </ccoEmployers>
        </chiefComplianceOfficer>
      </chiefComplianceOfficers>
      <isRegistrantSubmittedMatter>N</isRegistrantSubmittedMatter>
      <isPreviousLegalProceeding>N</isPreviousLegalProceeding>
      <isPreviousProceedingTerminated>N</isPreviousProceedingTerminated>
      <isFinancialSupportDuringPeriod>N</isFinancialSupportDuringPeriod>
      <isExemptionFromAct>N</isExemptionFromAct>
      <principalUnderwriters>
        <principalUnderwriter>
          <principalUnderwriterName>Park Avenue Securities</principalUnderwriterName>
          <principalUnderwriterFileNumber>8-51324</principalUnderwriterFileNumber>
          <principalUnderwriterCrdNumber>000046173</principalUnderwriterCrdNumber>
          <principalUnderwriterLei>N/A</principalUnderwriterLei>
          <principalUnderwriterRssdId>N/A</principalUnderwriterRssdId>
          <principalUnderWriterStateCountry principalUnderWriterState="US-NY" principalUnderWriterCountry="US"/>
          <isPrincipalUnderwriterAffiliatedWithRegistrant>Y</isPrincipalUnderwriterAffiliatedWithRegistrant>
        </principalUnderwriter>
      </principalUnderwriters>
      <isUnderwriterHiredOrTerminated>N</isUnderwriterHiredOrTerminated>
      <publicAccountants>
        <publicAccountant>
          <publicAccountantName>PricewaterhouseCoopers LLP</publicAccountantName>
          <pcaobNumber>00238</pcaobNumber>
          <publicAccountantLei>5493002GVO7EO8RNNS37</publicAccountantLei>
          <publicAccountantRssdId>N/A</publicAccountantRssdId>
          <publicAccountantStateCountry publicAccountantState="US-NY" publicAccountantCountry="US"/>
        </publicAccountant>
      </publicAccountants>
      <isPublicAccountantChanged>N</isPublicAccountantChanged>
      <isOpinionOffered>N</isOpinionOffered>
      <isMaterialChange>N</isMaterialChange>
      <isAccountingPrincipleChange>N</isAccountingPrincipleChange>
    </registrantInfo>
    <unitInvestmentTrust>
      <depositors>
        <depositor>
          <depositorName>The Guardian Insurance &amp; Annuity Company, Inc.</depositorName>
          <depositorCrdNo>N/A</depositorCrdNo>
          <depositorLei>TGIU5N0SIMULU6I57R64</depositorLei>
          <depositorRssdId>N/A</depositorRssdId>
          <depositorStateCountry depositorState="US-DE" depositorCountry="US"/>
          <depositorUltimateParentname>The Guardian Life Insurance Company of America</depositorUltimateParentname>
        </depositor>
      </depositors>
      <uitAdmins>
        <uitAdmin>
          <uitAdminName>The Guardian Insurance &amp; Annuity Company, Inc.</uitAdminName>
          <uitAdminLei>TGIU5N0SIMULU6I57R64</uitAdminLei>
          <uitAdminRssdId>N/A</uitAdminRssdId>
          <uitAdminStateCountry uitAdminState="US-NY" uitAdminCountry="US"/>
          <isUitAdminAffiliated>N</isUitAdminAffiliated>
          <isUitAdminSubAdmin>N</isUitAdminSubAdmin>
        </uitAdmin>
      </uitAdmins>
      <isUitAdminHiredTerminated>N</isUitAdminHiredTerminated>
      <registrantSeparateInsuranceAccount isRegistrantSeparateInsuranceAccount="Y" separateAccountSeriesId="S000008784"/>
      <numOfContracts>5054</numOfContracts>
      <contractSecurities>
        <contractSecurity separateAccountSecurityName="Guardian Investor Individual" separateAccountContractId="C000023900" separateAccountTotalAsset="468616425.000000000000" numContractsSold="3" grossPremiumReceived="1012308.000000000000" grossPremiumReceivedSection1035="0.000000000000" numContractsAffected="0" contractValueRedeemed="124644760.000000000000" contractValueRedeemedSection1035="18386052.000000000000" numContractsAffectedRedeemed="103"/>
        <contractSecurity separateAccountSecurityName="Guardian Investor Group" separateAccountContractId="C000023901" separateAccountTotalAsset="4216933.000000000000" numContractsSold="0" grossPremiumReceived="0.000000000000" grossPremiumReceivedSection1035="0.000000000000" numContractsAffected="0" contractValueRedeemed="721264.000000000000" contractValueRedeemedSection1035="0.000000000000" numContractsAffectedRedeemed="0"/>
      </contractSecurities>
      <isRule6C7Reliance>N</isRule6C7Reliance>
      <isRule11A2Reliance>N</isRule11A2Reliance>
      <isRule12D1Dash4Reliance>N</isRule12D1Dash4Reliance>
      <isRule12D1GReliance>N</isRule12D1GReliance>
    </unitInvestmentTrust>
    <signature registrantSignedName="Guardian Separate Account D" signedDate="2026-03-04" signature="Shawn Mcgrath" title="Controller - Individual Markets"/>
  </formData>
</edgarSubmission>
