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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 S7uHURHc1qcb1pD1s48YC4u5o0CvZzMflh0xNVkThyr3U+Gz8GJ+xHgOpMnVBhgM
 3cWD/vPdGfs/lINMzcGEgw==

<SEC-DOCUMENT>0001234006-03-000036.txt : 20031218
<SEC-HEADER>0001234006-03-000036.hdr.sgml : 20031218
<ACCEPTANCE-DATETIME>20031218131735
ACCESSION NUMBER:		0001234006-03-000036
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030911
FILED AS OF DATE:		20031218

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COULON MAURICE
		CENTRAL INDEX KEY:			0001257808

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	814-00237
		FILM NUMBER:		031061807

	BUSINESS ADDRESS:	
		STREET 1:		489 PRESTWICK CIR.
		CITY:			PALM BEACH GARDENS
		STATE:			FL
		ZIP:			33418

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GLADSTONE CAPITAL CORP
		CENTRAL INDEX KEY:			0001143513
		IRS NUMBER:				542040781
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		1750 TYSONS BLVD 4TH FLOOR
		CITY:			MCLEAN
		STATE:			VA
		ZIP:			22102
		BUSINESS PHONE:		7037441165

	MAIL ADDRESS:	
		STREET 1:		1750 TYSONS BLVD
		STREET 2:		4TH FLOOR
		CITY:			MCLEAN
		STATE:			VA
		ZIP:			22102
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-09-11</periodOfReport>
    <issuer>
        <issuerCik>0001143513</issuerCik>
        <issuerName>GLADSTONE CAPITAL CORP</issuerName>
        <issuerTradingSymbol>GLAD</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001257808</rptOwnerCik>
            <rptOwnerName>COULON MAURICE</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GLADSTONE CAPITAL CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>1616 ANDERSON ROAD, SUITE 208</rptOwnerStreet2>
            <rptOwnerCity>MCLEAN</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>22102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><derivativeTable><derivativeTransaction><securityTitle><value>Stock Option (Right to Buy)</value></securityTitle><conversionOrExercisePrice><value>19.71</value></conversionOrExercisePrice><transactionDate><value>2003-09-11</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>10000</value></transactionShares><transactionPricePerShare><value>19.71</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F1"/></exerciseDate><expirationDate><value>2013-09-10</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTi
tle><underlyingSecurityShares><value>10000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>10000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">Fifty percent of the shares underlying this option vest on 9/11/04 and 50% vest on 9/11/05</footnote></footnotes><remarks/><ownerSignature><signatureName>Skye Breeden, attorney-in-fact</signatureName><signatureDate>2003-12-18</signatureDate></ownerSignature></ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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