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      <regStreet1>2050 M Street NW</regStreet1>
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      <regCity>Washington</regCity>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Walt Disney Co/The</name>
        <lei>549300GZKULIZ0WOW665</lei>
        <title>Walt Disney Co/The</title>
        <cusip>254687106</cusip>
        <identifiers>
          <isin value="US2546871060"/>
        </identifiers>
        <balance>19516.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1926229.20000000</valUSD>
        <pctVal>3.313623808232</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Linde PLC</name>
        <lei>5299003QR1WT0EF88V51</lei>
        <title>Linde PLC</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="IE000S9YS762"/>
        </identifiers>
        <balance>4089.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1904001.96000000</valUSD>
        <pctVal>3.275387075212</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>IE</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Robert Half Inc</name>
        <lei>529900VPCUY9H3HLIC08</lei>
        <title>Robert Half Inc</title>
        <cusip>770323103</cusip>
        <identifiers>
          <isin value="US7703231032"/>
        </identifiers>
        <balance>18589.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1014029.95000000</valUSD>
        <pctVal>1.744399775779</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>CMS Energy Corp</name>
        <lei>549300IA9XFBAGNIBW29</lei>
        <title>CMS Energy Corp</title>
        <cusip>125896100</cusip>
        <identifiers>
          <isin value="US1258961002"/>
        </identifiers>
        <balance>24778.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1861075.58000000</valUSD>
        <pctVal>3.201542345432</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Hershey Co/The</name>
        <lei>21X2CX66SU2BR6QTAD08</lei>
        <title>Hershey Co/The</title>
        <cusip>427866108</cusip>
        <identifiers>
          <isin value="US4278661081"/>
        </identifiers>
        <balance>7634.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1305643.02000000</valUSD>
        <pctVal>2.246051402462</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Bank of America Corp</name>
        <lei>9DJT3UXIJIZJI4WXO774</lei>
        <title>Bank of America Corp</title>
        <cusip>060505104</cusip>
        <identifiers>
          <isin value="US0605051046"/>
        </identifiers>
        <balance>59881.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2498834.13000000</valUSD>
        <pctVal>4.298655770555</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Intel Corp</name>
        <lei>KNX4USFCNGPY45LOCE31</lei>
        <title>Intel Corp</title>
        <cusip>458140100</cusip>
        <identifiers>
          <isin value="US4581401001"/>
        </identifiers>
        <balance>54433.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1236173.43000000</valUSD>
        <pctVal>2.126545329471</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Abbott Laboratories</name>
        <lei>HQD377W2YR662HK5JX27</lei>
        <title>Abbott Laboratories</title>
        <cusip>002824100</cusip>
        <identifiers>
          <isin value="US0028241000"/>
        </identifiers>
        <balance>12385.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1642870.25000000</valUSD>
        <pctVal>2.826171451578</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Charles Schwab Corp/The</name>
        <lei>549300VSGCJ7E698NM85</lei>
        <title>Charles Schwab Corp/The</title>
        <cusip>808513105</cusip>
        <identifiers>
          <isin value="US8085131055"/>
        </identifiers>
        <balance>21972.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1719968.16000000</valUSD>
        <pctVal>2.958800253042</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Morgan Stanley &amp; Co. LLC</name>
        <lei>549300BI6Y5SI6BYPB26</lei>
        <title>Morgan Stanley Institutional Liquidity Funds - Government Portfolio</title>
        <cusip>61747C707</cusip>
        <identifiers>
          <isin value="US61747C7074"/>
        </identifiers>
        <balance>2552644.57000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2552644.57000000</valUSD>
        <pctVal>4.391223962915</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Emerson Electric Co</name>
        <lei>FGLT0EWZSUIRRITFOA30</lei>
        <title>Emerson Electric Co</title>
        <cusip>291011104</cusip>
        <identifiers>
          <isin value="US2910111044"/>
        </identifiers>
        <balance>13386.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1467641.04000000</valUSD>
        <pctVal>2.524730853463</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Mid-America Apartment Communities Inc</name>
        <lei>549300FQZKFR5YNSHZ21</lei>
        <title>Mid-America Apartment Communities Inc</title>
        <cusip>59522J103</cusip>
        <identifiers>
          <isin value="US59522J1034"/>
        </identifiers>
        <balance>10592.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1775007.36000000</valUSD>
        <pctVal>3.053482237671</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerConditional desc="REIT" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Mettler-Toledo International Inc</name>
        <lei>5493000BD5GJNUDIUG10</lei>
        <title>Mettler-Toledo International Inc</title>
        <cusip>592688105</cusip>
        <identifiers>
          <isin value="US5926881054"/>
        </identifiers>
        <balance>1040.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1228146.40000000</valUSD>
        <pctVal>2.112736714319</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Travelers Cos Inc/The</name>
        <lei>549300Y650407RU8B149</lei>
        <title>Travelers Cos Inc/The</title>
        <cusip>89417E109</cusip>
        <identifiers>
          <isin value="US89417E1091"/>
        </identifiers>
        <balance>7502.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1983978.92000000</valUSD>
        <pctVal>3.412968604329</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Bristol-Myers Squibb Co</name>
        <lei>HLYYNH7UQUORYSJQCN42</lei>
        <title>Bristol-Myers Squibb Co</title>
        <cusip>110122108</cusip>
        <identifiers>
          <isin value="US1101221083"/>
        </identifiers>
        <balance>19682.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1200405.18000000</valUSD>
        <pctVal>2.065014476975</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>American International Group Inc</name>
        <lei>ODVCVCQG2BP6VHV36M30</lei>
        <title>American International Group Inc</title>
        <cusip>026874784</cusip>
        <identifiers>
          <isin value="US0268747849"/>
        </identifiers>
        <balance>24350.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2116989.00000000</valUSD>
        <pctVal>3.641781129766</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="Monthly returns presented in Item B.5(a) have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2025-04-15</ncom:dateSigned>
      <ncom:nameOfApplicant>Calvert Social Investment Fund</ncom:nameOfApplicant>
      <ncom:signature>James Kirchner</ncom:signature>
      <ncom:signerName>James Kirchner</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
