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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,
 GWJ8JYoTcJUC7Q4O+ScZHfaXCzYXa1tzvaryZyR4pPQow34lSl+P/5HR2YWLP1PS
 2jwJAr/wNf7VOF8w2116lQ==

<SEC-DOCUMENT>0000313616-09-000090.txt : 20090922
<SEC-HEADER>0000313616-09-000090.hdr.sgml : 20090922
<ACCEPTANCE-DATETIME>20090922174040
ACCESSION NUMBER:		0000313616-09-000090
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090922
FILED AS OF DATE:		20090922
DATE AS OF CHANGE:		20090922

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALIGN TECHNOLOGY INC
		CENTRAL INDEX KEY:			0001097149
		STANDARD INDUSTRIAL CLASSIFICATION:	ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES [3842]
		IRS NUMBER:				943267295
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		851 MARTIN AVENUE
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95050
		BUSINESS PHONE:		4087381500

	MAIL ADDRESS:	
		STREET 1:		851 MARTIN AVENUE
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95050

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DANAHER CORP /DE/
		CENTRAL INDEX KEY:			0000313616
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-32259
		FILM NUMBER:		091081408

	BUSINESS ADDRESS:	
		STREET 1:		2099 PENNSYLVANIA AVE N.W., 12TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006
		BUSINESS PHONE:		2028280850

	MAIL ADDRESS:	
		STREET 1:		2099 PENNSYLVANIA AVE. N.W., 12TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006

	FORMER NAME:	
		FORMER CONFORMED NAME:	DMG INC
		DATE OF NAME CHANGE:	19850221
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2009-09-22</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001097149</issuerCik>
        <issuerName>ALIGN TECHNOLOGY INC</issuerName>
        <issuerTradingSymbol>ALGN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000313616</rptOwnerCik>
            <rptOwnerName>DANAHER CORP /DE/</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2099 PENNSYLVANIA AVENUE, NW</rptOwnerStreet1>
            <rptOwnerStreet2>12TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20006</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8437132</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On August 16, 2009, the Reporting Person entered into a Stock Purchase Agreement with the Issuer in connection with the settlement of certain litigation pursuant to which the Issuer would grant to the Reporting Person at no additional cost 7,586,489 fully paid and nonassessable shares of Issuer common stock (the &quot;Shares&quot;).  With respect to the Shares, 5,561,489 were issued to the Reporting Person on August 17, 2009, and the balance of 2,025,000 (the &quot;Second Tranche Shares&quot;) are to be issued to the Reporting Person upon receipt of clearance under the Hart-Scott-Rodino Antitrust Improvements Act, as amended (the &quot;HSR Act&quot;) and fulfillment of certain other conditions.  The waiting period under the HSR Act expired at 11:59 p.m. (EDT) on September 21, 2009.  On September 22, 2009 the Issuer issued the Second Tranche Shares to the Reporting Person.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>James F. O'Reilly, Associate General Counsel and Secretary</signatureName>
        <signatureDate>2009-09-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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