<SEC-DOCUMENT>0001140361-14-002326.txt : 20140116
<SEC-HEADER>0001140361-14-002326.hdr.sgml : 20140116
<ACCEPTANCE-DATETIME>20140116125637
ACCESSION NUMBER:		0001140361-14-002326
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20131125
FILED AS OF DATE:		20140116
DATE AS OF CHANGE:		20140116

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:		601 E. BEARDSLEY AVENUE
		CITY:			ELKHART
		STATE:			IN
		ZIP:			46514
		BUSINESS PHONE:		(574) 970-7460

	MAIL ADDRESS:	
		STREET 1:		601 E. BEARDSLEY AVENUE
		CITY:			ELKHART
		STATE:			IN
		ZIP:			46514

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ORTHWEIN PETER BUSCH
		CENTRAL INDEX KEY:			0001255017

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09235
		FILM NUMBER:		14531489

	MAIL ADDRESS:	
		STREET 1:		ONE LAGAYETTE PLACE
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2013-11-25</periodOfReport>

    <dateOfOriginalSubmission>2013-12-20</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001255017</rptOwnerCik>
            <rptOwnerName>ORTHWEIN PETER BUSCH</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>9 BENEDICT PLACE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GREENWICH</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06830</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Exec. Chairman of the Board</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>332368</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">This amendment is being filed solely to correct the number of Shares held for the account of The Indenture of Trust of Adolphus Busch Orthwein (the &quot;Indenture of Trust&quot;) of which the Reporting Person is a co-trustee and of which the heirs of the Reporting Person's father's estate are beneficiaries.  The original report stated that the number of Shares held for the account of the Indenture of Trust was 318,368, however, this amount failed to include an additional 14,000 held for this account.</footnote>
        <footnote id="F2">The Reporting Person disclaims beneficial ownership of the Shares held for the account of the Indenture of Trust except to the extent of his pecuniary interest in such Shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Peter B. Orthwein</signatureName>
        <signatureDate>2014-01-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
