<SEC-DOCUMENT>0000899243-20-034038.txt : 20201216
<SEC-HEADER>0000899243-20-034038.hdr.sgml : 20201216
<ACCEPTANCE-DATETIME>20201216111952
ACCESSION NUMBER:		0000899243-20-034038
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20201214
FILED AS OF DATE:		20201216
DATE AS OF CHANGE:		20201216

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Marshall Brad
		CENTRAL INDEX KEY:			0001510704

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	814-01299
		FILM NUMBER:		201391623

	MAIL ADDRESS:	
		STREET 1:		1290 BROADWAY
		STREET 2:		SUITE 1100
		CITY:			DENVER
		STATE:			CO
		ZIP:			80203

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Blackstone Secured Lending Fund
		CENTRAL INDEX KEY:			0001736035
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		345 PARK AVENUE
		STREET 2:		31ST FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10154
		BUSINESS PHONE:		212-503-2100

	MAIL ADDRESS:	
		STREET 1:		345 PARK AVENUE
		STREET 2:		31ST FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10154

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Blackstone / GSO Secured Lending Fund
		DATE OF NAME CHANGE:	20180329
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-12-14</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001736035</issuerCik>
        <issuerName>Blackstone Secured Lending Fund</issuerName>
        <issuerTradingSymbol>NONE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001510704</rptOwnerCik>
            <rptOwnerName>Marshall Brad</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BLACKSTONE CREDIT BDC ADVISORS LLC,</rptOwnerStreet1>
            <rptOwnerStreet2>31ST FLOOR, 345 PARK AVENUE</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10154</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle>CEO</officerTitle>
            <otherText>Trustee</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares of Beneficial Interest</value>
            </securityTitle>
            <transactionDate>
                <value>2020-12-14</value>
                <footnoteId id="F1"/>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>12774.45</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.05</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>75274.45</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The Issuer delivered a capital drawdown notice on December 1, 2020, and upon delivery of such capital drawdown notice, Mr. Marshall became obligated to make a capital contribution to purchase common shares at a price per share that was determined on December 14, 2020.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Marisa J. Beeney</signatureName>
        <signatureDate>2020-12-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
