-----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,
 QyEaBojgMDFUkMoqdrFTVpPKHSLjEwgbVjgHJSKae68/gjTc39XhS/37l4d8rr8S
 Ls/Pqn4YjN9l7r2Qf8OIcQ==

<SEC-DOCUMENT>0001180562-09-000003.txt : 20091021
<SEC-HEADER>0001180562-09-000003.hdr.sgml : 20091021
<ACCEPTANCE-DATETIME>20091020174511
ACCESSION NUMBER:		0001180562-09-000003
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
ITEM INFORMATION:		Investment Company Act Section 3(c)
ITEM INFORMATION:		Section 3(c)(7)
FILED AS OF DATE:		20091021
DATE AS OF CHANGE:		20091020
EFFECTIVENESS DATE:		20091021

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MORGAN STANLEY INSTITUTIONAL CAYMAN FUND LP
		CENTRAL INDEX KEY:			0001180562
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-47192
		FILM NUMBER:		091128738

	BUSINESS ADDRESS:	
		STREET 1:		100 FRONT STREET
		STREET 2:		SUITE 400
		CITY:			WEST CONSHOHOCKEN
		STATE:			PA
		ZIP:			19428-2881
		BUSINESS PHONE:		610-260-7600

	MAIL ADDRESS:	
		STREET 1:		100 FRONT STREET
		STREET 2:		SUITE 400
		CITY:			WEST CONSHOHOCKEN
		STATE:			PA
		ZIP:			19428-2881
</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>0001180562</cik>
        <entityName>MORGAN STANLEY INSTITUTIONAL CAYMAN FUND LP</entityName>
        <issuerAddress>
            <street1>100 FRONT STREET</street1>
            <street2>SUITE 400</street2>
            <city>WEST CONSHOHOCKEN</city>
            <stateOrCountry>PA</stateOrCountry>
            <zipCode>19428-2881</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>610-260-7600</issuerPhoneNumber>
        <jurisdictionOfInc>CAYMAN ISLANDS</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Morgan Stanley</firstName>
                <lastName>AIP (Cayman) GP Ltd.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General Partner</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jacques</firstName>
                <lastName>Chappuis</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Chairman and Managing Director of General Partner.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mustafa</firstName>
                <lastName>Jama</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>President and Managing Director of General Partner.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Thomas</firstName>
                <lastName>Dorr</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Managing Director of General Partner.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jeffrey</firstName>
                <lastName>Turner</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Treasurer and Executive Director of General Partner.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Noel</firstName>
                <lastName>Langlois</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Assistant Treasurer and Executive Director of General Partner.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Bernard</firstName>
                <lastName>Peterson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General Counsel, Secretary and Executive Director of General Partner.</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Robin</firstName>
                <lastName>Coroniti</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Morgan Stanley Alternative Investment</street1>
                <street2>100 Front Street, Suite 400</street2>
                <city>West Conshohocken</city>
                <stateOrCountry>PA</stateOrCountry>
                <zipCode>19428-2881</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Vice President of General Partner.</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.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2004-04-29</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>5000000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>803583310</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>16</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>MORGAN STANLEY INSTITUTIONAL CAYMAN FUND LP</issuerName>
                <signatureName>Robin Coroniti</signatureName>
                <nameOfSigner>Robin Coroniti</nameOfSigner>
                <signatureTitle>Vice President of General Partner</signatureTitle>
                <signatureDate>2009-10-20</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----