<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0201</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001420002</cik>
        <entityName>FLOATING RATE BANK LOAN SERIES OF HARTFORD INST TRUST</entityName>
        <issuerAddress>
            <street1>Hartford Investment Management Company</street1>
            <street2>55 Farmington Avenue</street2>
            <city>Hartford</city>
            <stateOrCountry>CT</stateOrCountry>
            <zipCode>06105</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>860-297-6900</issuerPhoneNumber>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <jurisdictionOfInc>DE</jurisdictionOfInc>
        <entityType>Business Trust</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>n/a</firstName>
                <middleName></middleName>
                <lastName>Hartford Investment Management Company</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>55 Farmington Avenue</street1>
                <street2></street2>
                <city>Hartford</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06105</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>n/a</firstName>
                <middleName></middleName>
                <lastName>BNY Mellon Trust of Delaware</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>4005 Kennett Pike</street1>
                <street2></street2>
                <city>Greenville</city>
                <stateOrCountry>DE</stateOrCountry>
                <zipCode>06105</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Trustee</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Marianne</firstName>
                <middleName></middleName>
                <lastName>Stearns</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>BNY Mellon Trust</street1>
                <street2>4005 Kennett Pike</street2>
                <city>Greenville</city>
                <stateOrCountry>DE</stateOrCountry>
                <zipCode>06105</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName></middleName>
                <lastName>Brown</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Hartford Investment Management Company</street1>
                <street2>55 Farmington Avenue</street2>
                <city>Hartford</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06105</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName>H.</middleName>
                <lastName>Davison</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Hartford Investment Management Company</street1>
                <street2>55 Farmington Avenue</street2>
                <city>Hartford</city>
                <stateOrCountry>CT</stateOrCountry>
                <zipCode>06105</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.1</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>9999999997-07-050326</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2006-05-15</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>325608967</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>10</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>FLOATING RATE BANK LOAN SERIES OF HARTFORD INST TRUST</issuerName>
                <signatureName>Marianne Stearns</signatureName>
                <nameOfSigner>Marianne Stearns</nameOfSigner>
                <signatureTitle>Assistant Vice President of the Trustee</signatureTitle>
                <signatureDate>2009-03-11</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
