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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 GJj2X7iwtw2BEY7QP7lypQHvjZJgqecCOj0Wv3dWGL0w6NIQOpvlayRXB7xUKpQ8
 KpCfnz90MRJjpE+SaiFG4w==

<SEC-DOCUMENT>0000902664-08-003403.txt : 20081210
<SEC-HEADER>0000902664-08-003403.hdr.sgml : 20081210
<ACCEPTANCE-DATETIME>20081210194555
ACCESSION NUMBER:		0000902664-08-003403
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080908
FILED AS OF DATE:		20081210
DATE AS OF CHANGE:		20081210

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Robeco-Sage Multi-Strategy Master Fund, L.L.C.
		CENTRAL INDEX KEY:			0001441465
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1208

	BUSINESS ADDRESS:	
		STREET 1:		909 3RD AVENUE, 28TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		(212) 908-9660

	MAIL ADDRESS:	
		STREET 1:		909 3RD AVENUE, 28TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			REED DAVID C
		CENTRAL INDEX KEY:			0001292356

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-22223
		FILM NUMBER:		081242170

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(609)655-4500

	MAIL ADDRESS:	
		STREET 1:		C/O 1ST CONSTITUTION BANCORP
		STREET 2:		2650 ROUTE 130
		CITY:			CRANBURY
		STATE:			NJ
		ZIP:			08512
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>p08-1634form3_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2008-09-08</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001441465</issuerCik>
        <issuerName>Robeco-Sage Multi-Strategy Master Fund, L.L.C.</issuerName>
        <issuerTradingSymbol>N/A</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001292356</rptOwnerCik>
            <rptOwnerName>REED DAVID C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ROBECO INVETMENT MANAGEMENT, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>909 THIRD AVENUE</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Limited Liability Company Interests</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <remarks>On September 8, 2008, the Reporting Person became a member of the Board of Managers of the Issuer.  The Reporting Person owns
 no beneficial interests in the Issuer.</remarks>

    <ownerSignature>
        <signatureName>/s/ David C. Reed</signatureName>
        <signatureDate>2008-12-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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