-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 PR/6TcwuIyKQuKGHyxjlty6zOyYI5bMUWRZpXASNXtjpK0wgTFfpjwRgtrHGCLG2
 ImckaQR33zdnFbxMJMkwDA==

<SEC-DOCUMENT>0001475711-09-000001.txt : 20091104
<SEC-HEADER>0001475711-09-000001.hdr.sgml : 20091104
<ACCEPTANCE-DATETIME>20091104142121
ACCESSION NUMBER:		0001475711-09-000001
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20091104
DATE AS OF CHANGE:		20091104
EFFECTIVENESS DATE:		20091104

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Loomis Sayles High Grade Long Duration Corporate Bond Trust
		CENTRAL INDEX KEY:			0001475711
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			NH
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-135852
		FILM NUMBER:		091157364

	BUSINESS ADDRESS:	
		STREET 1:		ONE FINANCIAL CENTER
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02111
		BUSINESS PHONE:		800-343-2029

	MAIL ADDRESS:	
		STREET 1:		ONE FINANCIAL CENTER
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02111
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001475711</cik>
        <entityName>Loomis Sayles High Grade Long Duration Corporate Bond Trust</entityName>
        <issuerAddress>
            <street1>ONE FINANCIAL CENTER</street1>
            <city>BOSTON</city>
            <stateOrCountry>MA</stateOrCountry>
            <zipCode>02111</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>800-343-2029</issuerPhoneNumber>
        <jurisdictionOfInc>NEW HAMPSHIRE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Business Trust</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>.</firstName>
                <lastName>Loomis Sayles Trust Company</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Financial Center</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02111</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Beneficial Owner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>.</firstName>
                <lastName>Loomis Sayles &amp; Company, LP</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Financial Center</street1>
                <city>Boston</city>
                <stateOrCountry>MA</stateOrCountry>
                <zipCode>02111</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Beneficial Owner</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Investing</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-10-15</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>30010000</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>2</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>Loomis Sayles High Grade Long Duration Corporate Bond Trust</issuerName>
                <signatureName>Lauren B. Pitlalis</signatureName>
                <nameOfSigner>Lauren B. Pitlais</nameOfSigner>
                <signatureTitle>Vice President</signatureTitle>
                <signatureDate>2009-10-27</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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