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          <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>13670.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>561153.50000000</valUSD>
        <pctVal>0.934905351184</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>Steel Dynamics Inc</name>
        <lei>549300HGGKEL4FYTTQ83</lei>
        <title>Steel Dynamics Inc</title>
        <cusip>858119100</cusip>
        <identifiers>
          <isin value="US8581191009"/>
        </identifiers>
        <balance>12726.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1629055.26000000</valUSD>
        <pctVal>2.714074633678</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>8376.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1389997.20000000</valUSD>
        <pctVal>2.315793843239</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>First Industrial Realty Trust Inc</name>
        <lei>N/A</lei>
        <title>First Industrial Realty Trust Inc</title>
        <cusip>32054K103</cusip>
        <identifiers>
          <isin value="US32054K1034"/>
        </identifiers>
        <balance>32692.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1573465.96000000</valUSD>
        <pctVal>2.621460520002</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>Bank of America Corp</name>
        <lei>9DJT3UXIJIZJI4WXO774</lei>
        <title>Bank of America Corp</title>
        <cusip>060505104</cusip>
        <identifiers>
          <isin value="US0605051046"/>
        </identifiers>
        <balance>53638.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2538150.16000000</valUSD>
        <pctVal>4.228665002882</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>68964.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1544793.60000000</valUSD>
        <pctVal>2.573691161360</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>14758.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2007235.58000000</valUSD>
        <pctVal>3.344138965239</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>Goldman Sachs Group Inc/The</name>
        <lei>784F5XWPLTWKTBV3E584</lei>
        <title>Goldman Sachs Group Inc/The</title>
        <cusip>38141G104</cusip>
        <identifiers>
          <isin value="US38141G1040"/>
        </identifiers>
        <balance>3104.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2196856.00000000</valUSD>
        <pctVal>3.660054566500</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>24110.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2199796.40000000</valUSD>
        <pctVal>3.664953396668</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>817030.61000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>817030.61000000</valUSD>
        <pctVal>1.361207386875</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>14688.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1958351.04000000</valUSD>
        <pctVal>3.262695263942</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>Ingersoll Rand Inc</name>
        <lei>5299004C02FMZCUOIR50</lei>
        <title>Ingersoll Rand Inc</title>
        <cusip>45687V106</cusip>
        <identifiers>
          <isin value="US45687V1061"/>
        </identifiers>
        <balance>15364.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1277977.52000000</valUSD>
        <pctVal>2.129164341204</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>Neurocrine Biosciences Inc</name>
        <lei>549300FECER0XBN49756</lei>
        <title>Neurocrine Biosciences Inc</title>
        <cusip>64125C109</cusip>
        <identifiers>
          <isin value="US64125C1099"/>
        </identifiers>
        <balance>8773.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1102678.37000000</valUSD>
        <pctVal>1.837108578577</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>Mettler-Toledo International Inc</name>
        <lei>5493000BD5GJNUDIUG10</lei>
        <title>Mettler-Toledo International Inc</title>
        <cusip>592688105</cusip>
        <identifiers>
          <isin value="US5926881054"/>
        </identifiers>
        <balance>1083.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1272221.76000000</valUSD>
        <pctVal>2.119575002771</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>6122.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1637879.88000000</valUSD>
        <pctVal>2.728776822046</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>Amazon.com Inc</name>
        <lei>ZXTILKJKG63JELOEG630</lei>
        <title>Amazon.com Inc</title>
        <cusip>023135106</cusip>
        <identifiers>
          <isin value="US0231351067"/>
        </identifiers>
        <balance>10913.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2394203.07000000</valUSD>
        <pctVal>3.988843091892</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>24610.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2106369.90000000</valUSD>
        <pctVal>3.509300915141</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>2025-07-25</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>
  <documents>XXXX</documents>
</edgarSubmission>
