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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Calvert Floating-Rate Advantage Fund</name>
        <lei>549300GG1YFY0YH1UJ86</lei>
        <title>Calvert Floating-Rate Advantage Fund</title>
        <cusip>13161X865</cusip>
        <identifiers>
          <isin value="US13161X8653"/>
        </identifiers>
        <balance>203311.30000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1791172.51000000</valUSD>
        <pctVal>0.536486708071</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert Mid-Cap Fund</name>
        <lei>549300Y1UC9HCBUDKZ85</lei>
        <title>Calvert Mid-Cap Fund</title>
        <cusip>131649709</cusip>
        <identifiers>
          <isin value="US1316497098"/>
        </identifiers>
        <balance>75834.15000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>3427703.35000000</valUSD>
        <pctVal>1.026655599178</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>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>2828.35000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2828.35000000</valUSD>
        <pctVal>0.000847139051</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>Calvert Small Cap Fund</name>
        <lei>549300MIJR64EECJ6M85</lei>
        <title>Calvert Small Cap Fund</title>
        <cusip>13161P672</cusip>
        <identifiers>
          <isin value="US13161P6723"/>
        </identifiers>
        <balance>279239.73000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>9876709.18000000</valUSD>
        <pctVal>2.958242807418</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert Equity Fund</name>
        <lei>5493008KHIQHXPKPLB89</lei>
        <title>Calvert Equity Fund</title>
        <cusip>131582280</cusip>
        <identifiers>
          <isin value="US1315822809"/>
        </identifiers>
        <balance>297244.90000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>27376255.38000000</valUSD>
        <pctVal>8.199655279506</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Chicago Board of Trade</name>
        <lei>549300EX04Q2QBFQTQ27</lei>
        <title>US LONG BOND(CBT) JUN25</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Bloomberg Identifier" value="BBG01PSLLQ96"/>
        </identifiers>
        <balance>13.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>31453.56000000</valUSD>
        <pctVal>0.009420877535</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DIR</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Chicago Board of Trade</counterpartyName>
              <counterpartyLei>549300EX04Q2QBFQTQ27</counterpartyLei>
            </counterparties>
            <payOffProf>Long</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>CBOT U.S. Long Bond Futures</indexName>
                <indexIdentifier>USM5 Comdty</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <expDate>2025-06-18</expDate>
            <notionalAmt>1493202.69000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>31453.56000000</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Chicago Board of Trade</name>
        <lei>549300EX04Q2QBFQTQ27</lei>
        <title>US 5YR NOTE (CBT) JUN25</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Bloomberg Identifier" value="BBG01Q0CG9M3"/>
        </identifiers>
        <balance>9.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>14193.49000000</valUSD>
        <pctVal>0.004251192268</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DIR</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Chicago Board of Trade</counterpartyName>
              <counterpartyLei>549300EX04Q2QBFQTQ27</counterpartyLei>
            </counterparties>
            <payOffProf>Long</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>CBOT 5 Year U.S. Treasury Notes</indexName>
                <indexIdentifier>FVM5 Comdty</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <expDate>2025-06-30</expDate>
            <notionalAmt>959212.76000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>14193.49000000</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Calvert International Responsible Index Fund</name>
        <lei>5493002R7L7YSTUULM88</lei>
        <title>Calvert International Responsible Index Fund</title>
        <cusip>13161Y848</cusip>
        <identifiers>
          <isin value="US13161Y8488"/>
        </identifiers>
        <balance>886363.05000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>27424072.80000000</valUSD>
        <pctVal>8.213977412132</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>Calvert International Equity Fund</name>
        <lei>549300DYXGATLWKZ1990</lei>
        <title>Calvert International Equity Fund</title>
        <cusip>131649741</cusip>
        <identifiers>
          <isin value="US1316497411"/>
        </identifiers>
        <balance>1069412.68000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>26328940.28000000</valUSD>
        <pctVal>7.885966549260</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</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>
    </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>
