<SEC-DOCUMENT>0001226579-12-000022.txt : 20120110
<SEC-HEADER>0001226579-12-000022.hdr.sgml : 20120110
<ACCEPTANCE-DATETIME>20120110114032
ACCESSION NUMBER:		0001226579-12-000022
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20120109
FILED AS OF DATE:		20120110
DATE AS OF CHANGE:		20120110

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Wu Eugene
		CENTRAL INDEX KEY:			0001539075

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-07891
		FILM NUMBER:		12519176

	MAIL ADDRESS:	
		STREET 1:		P.O. BOX 1299
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55440-1299

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DONALDSON CO INC
		CENTRAL INDEX KEY:			0000029644
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFYING EQUIP [3564]
		IRS NUMBER:				410222640
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0731

	BUSINESS ADDRESS:	
		STREET 1:		1400 W. 94TH ST.
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55431
		BUSINESS PHONE:		6128873131

	MAIL ADDRESS:	
		STREET 1:		1400 W 94TH STREET
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55431
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2012-01-09</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000029644</issuerCik>
        <issuerName>DONALDSON CO INC</issuerName>
        <issuerTradingSymbol>DCI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001539075</rptOwnerCik>
            <rptOwnerName>Wu Eugene</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1400 WEST 94TH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BLOOMINGTON</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55431-2303</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Eugene Wu</signatureName>
        <signatureDate>2012-01-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poavermeersch1.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
<HTML><BODY><PRE>POWER OF ATTORNEY







 KNOW ALL PERSONS BY THESE PRESENTS, that I, Wim Vermeersch,

hereby constitute and appoint Norman C. Linnell, Amy C. Becker, and

William M. Cook, and each of them, my true and lawful

attorneys-in-fact and agents, each acting alone, with full powers of

substitution and resubstitution, for me and in my name, place and

stead, to sign any reports on Form 3 (Initial Statement of Beneficial

Ownership of Securities), Form 4 (Statement of Changes in Beneficial

Ownership of Securities) and Form 5 (Annual Statement of Changes in

Beneficial Ownership) relating to transactions by me in Common Stock

or other securities of Donaldson Company, Inc., and all amendments

thereto, and to file the same, with the Securities and Exchange

Commission and the New York Stock Exchange, Inc., granting unto said

attorneys-in-fact and agents, and each of them, or their substitutes,

full power and authority to do and perform each and every act and

thing requisite or necessary to be done, as fully to all intents

and purposes as I might or could do in person,hereby ratifying and

confirming all that said attorneys-in-fact and agents, and each of

them, or their substitutes, may lawfully do or cause to be done by

virtue hereof.  This Power of Attorney shall be effective until such

time as I deliver a written revocation thereof to the above-named

attorneys-in-fact and agents.





Dated: January 1, 2012







Wim Vermeersch

(signature)

Wim Vermeersch

</PRE></BODY></HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
