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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,
 Fxt06MCxH+WWrD9HNaSzcnktBS8s8tyKUDhQPfzLlC13sJreRwDe58JKVaRAh8Xo
 Y3Iu8w5mBGMt52FhhH0JNw==

<SEC-DOCUMENT>0001140361-11-010685.txt : 20110218
<SEC-HEADER>0001140361-11-010685.hdr.sgml : 20110218
<ACCEPTANCE-DATETIME>20110218120733
ACCESSION NUMBER:		0001140361-11-010685
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20101207
FILED AS OF DATE:		20110218
DATE AS OF CHANGE:		20110218

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ZIEMER  JAMES L
		CENTRAL INDEX KEY:			0001243086

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09235
		FILM NUMBER:		11623418

	MAIL ADDRESS:	
		STREET 1:		C/O HARLEY DAVIDSON
		STREET 2:		3700 W. JUNEAU AVE
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53208

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			THOR INDUSTRIES INC
		CENTRAL INDEX KEY:			0000730263
		STANDARD INDUSTRIAL CLASSIFICATION:	MOTOR HOMES [3716]
		IRS NUMBER:				930768752
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0731

	BUSINESS ADDRESS:	
		STREET 1:		419 W PIKE ST
		CITY:			JACKSON CENTER
		STATE:			OH
		ZIP:			45334
		BUSINESS PHONE:		9375966849

	MAIL ADDRESS:	
		STREET 1:		419 W PIKE STREET
		CITY:			JACKSON CENTER
		STATE:			OH
		ZIP:			45334
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2010-12-07</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000730263</issuerCik>
        <issuerName>THOR INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>THO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001243086</rptOwnerCik>
            <rptOwnerName>ZIEMER  JAMES L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THOR INDUSTRIES INC</rptOwnerStreet1>
            <rptOwnerStreet2>419 WEST PIKE STREET</rptOwnerStreet2>
            <rptOwnerCity>JACKSON CENTER</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>45334-0629</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ James L. Ziemer</signatureName>
        <signatureDate>2011-02-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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