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          <other otherDesc="Internal Identifier" value="ADI1KFB94"/>
        </identifiers>
        <balance>12.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>1350.00000000</valUSD>
        <pctVal>0.000456116506</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Options Clearing Corp.</counterpartyName>
              <counterpartyLei>549300CII6SLYGKNHA04</counterpartyLei>
            </counterparties>
            <putOrCall>Call</putOrCall>
            <writtenOrPur>Purchased</writtenOrPur>
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              <indexBasketInfo>
                <indexName>S&amp;P 500 Index</indexName>
                <indexIdentifier>SPX Index</indexIdentifier>
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            <shareNo>100.00000000</shareNo>
            <exercisePrice>3275.00000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2020-05-15</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-32513.03000000</unrealizedAppr>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Calvert US Large Cap Growth Responsible Index Fund</name>
        <lei>5493000179G37BJVLO31</lei>
        <title>Calvert US Large Cap Growth Responsible Index Fund</title>
        <cusip>13162A807</cusip>
        <identifiers>
          <isin value="US13162A8071"/>
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        <balance>578552.34900000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>16245749.96000000</valUSD>
        <pctVal>5.488855342133</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 Absolute Return Bond Fund</name>
        <lei>549300HDLJYKTU171023</lei>
        <title>Calvert Absolute Return Bond Fund</title>
        <cusip>13161X840</cusip>
        <identifiers>
          <isin value="US13161X8406"/>
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        <balance>1405794.99000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>19146927.76000000</valUSD>
        <pctVal>6.469059106515</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>
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      </invstOrSec>
      <invstOrSec>
        <name>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>9128284H0</cusip>
        <identifiers>
          <isin value="US9128284H06"/>
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        <balance>4566020.68000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>4601231.69000000</valUSD>
        <pctVal>1.554590905574</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2023-04-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.63000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Calvert Short-Duration Income Fund</name>
        <lei>549300KRHGOWQEB8SR45</lei>
        <title>Calvert Short-Duration Income Fund</title>
        <cusip>131582264</cusip>
        <identifiers>
          <isin value="US1315822643"/>
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        <balance>624534.85800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>9655308.90000000</valUSD>
        <pctVal>3.262182045531</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 Responsible Index Fund</name>
        <lei>5493002R7L7YSTUULM88</lei>
        <title>Calvert International Responsible Index Fund</title>
        <cusip>13161Y848</cusip>
        <identifiers>
          <isin value="US13161Y8488"/>
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        <balance>316687.81900000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>6140576.81000000</valUSD>
        <pctVal>2.074680326259</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>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>9128285W6</cusip>
        <identifiers>
          <isin value="US9128285W63"/>
        </identifiers>
        <balance>6950490.12000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>7560354.69000000</valUSD>
        <pctVal>2.554372271566</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-01-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.88000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Calvert International Opportunities Fund</name>
        <lei>549300125QOYCBC7IB51</lei>
        <title>Calvert International Opportunities Fund</title>
        <cusip>131649758</cusip>
        <identifiers>
          <isin value="US1316497585"/>
        </identifiers>
        <balance>1155223.87800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>15156537.28000000</valUSD>
        <pctVal>5.120849503556</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>165897.43800000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>9255418.07000000</valUSD>
        <pctVal>3.127073298695</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>Options Clearing Corp.</name>
        <lei>549300CII6SLYGKNHA04</lei>
        <title>S+P 500 INDEX MAY20 2600 PUT</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="ADI1KH7X2"/>
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        <balance>-12.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-205200.00000000</valUSD>
        <pctVal>-0.06932970893</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Options Clearing Corp.</counterpartyName>
              <counterpartyLei>549300CII6SLYGKNHA04</counterpartyLei>
            </counterparties>
            <putOrCall>Put</putOrCall>
            <writtenOrPur>Written</writtenOrPur>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>S&amp;P 500 Index</indexName>
                <indexIdentifier>SPX Index</indexIdentifier>
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            <shareNo>100.00000000</shareNo>
            <exercisePrice>2600.00000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2020-05-15</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-164783.03000000</unrealizedAppr>
          </optionSwaptionWarrantDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Options Clearing Corp.</name>
        <lei>549300CII6SLYGKNHA04</lei>
        <title>S+P 500 INDEX APR20 3375 CALL</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Internal Identifier" value="ADI1J9241"/>
        </identifiers>
        <balance>12.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>120.00000000</valUSD>
        <pctVal>0.000040543689</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <optionSwaptionWarrantDeriv derivCat="OPT">
            <counterparties>
              <counterpartyName>Options Clearing Corp.</counterpartyName>
              <counterpartyLei>549300CII6SLYGKNHA04</counterpartyLei>
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            <putOrCall>Call</putOrCall>
            <writtenOrPur>Purchased</writtenOrPur>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>S&amp;P 500 Index</indexName>
                <indexIdentifier>SPX Index</indexIdentifier>
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            <shareNo>100.00000000</shareNo>
            <exercisePrice>3375.00000000</exercisePrice>
            <exercisePriceCurCd>USD</exercisePriceCurCd>
            <expDt>2020-04-17</expDt>
            <delta>XXXX</delta>
            <unrealizedAppr>-28703.03000000</unrealizedAppr>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Calvert US Mid Cap Core Responsible Index Fund</name>
        <lei>549300I74Z158YTBPO44</lei>
        <title>Calvert US Mid Cap Core Responsible Index Fund</title>
        <cusip>13161Y301</cusip>
        <identifiers>
          <isin value="US13161Y3018"/>
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        <balance>120571.61300000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>2598318.26000000</valUSD>
        <pctVal>0.877878404941</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 Emerging Markets Equity Fund</name>
        <lei>549300L4S5NY62FOKA38</lei>
        <title>Calvert Emerging Markets Equity Fund</title>
        <cusip>131649766</cusip>
        <identifiers>
          <isin value="US1316497668"/>
        </identifiers>
        <balance>679533.34400000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>9268834.81000000</valUSD>
        <pctVal>3.131606333193</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>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>912810RL4</cusip>
        <identifiers>
          <isin value="US912810RL44"/>
        </identifiers>
        <balance>5033225.15000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>5758813.48000000</valUSD>
        <pctVal>1.945696210508</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2045-02-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.75000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <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>2020-04-16</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>
