    <SEC-DOCUMENT>0001097149-21-000012-index.html : 20210326
    <SEC-HEADER>0001097149-21-000012.hdr.sgml : 20210326
    <ACCEPTANCE-DATETIME>20210326160420
    ACCESSION NUMBER:		0001097149-21-000012
    CONFORMED SUBMISSION TYPE:	PRE 14A
    PUBLIC DOCUMENT COUNT:		15
    CONFORMED PERIOD OF REPORT:	20201231
    FILED AS OF DATE:		20210326
    DATE AS OF CHANGE:		20210326

    FILER:

    	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

    	FILING VALUES:
    		FORM TYPE:		PRE 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-32259
    		FILM NUMBER:		21777287

    	BUSINESS ADDRESS:
    		STREET 1:		410 NORTH SCOTTSDALE ROAD, SUITE 1300
    		CITY:			TEMPE
    		STATE:			AZ
    		ZIP:			85281
    		BUSINESS PHONE:		408-470-1000

    	MAIL ADDRESS:
    		STREET 1:		410 NORTH SCOTTSDALE ROAD, SUITE 1300
    		CITY:			TEMPE
    		STATE:			AZ
    		ZIP:			85281
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>PRE 14A
    <SEQUENCE>1
    <FILENAME>algn-20201231xpre14a.htm
    <DESCRIPTION>PRE 14A
    <TEXT>
    Document 1 - file: algn-20201231xpre14a.htm

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    <TYPE>EX-1
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    <FILENAME>amendedandrestatedbylawsup.htm
    <DESCRIPTION>EX-1
    <TEXT>
    Document 2 - file: amendedandrestatedbylawsup.htm

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    <TYPE>EX-2
    <SEQUENCE>3
    <FILENAME>alignamendedandrestated201.htm
    <DESCRIPTION>EX-2
    <TEXT>
    Document 3 - file: alignamendedandrestated201.htm

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>ceo1.jpg
    <TEXT>
    Document 4 - file: ceo1.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>ceo20201a.jpg
    <TEXT>
    Document 5 - file: ceo20201a.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>chart3a061.jpg
    <TEXT>
    Document 6 - file: chart3a061.jpg

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    <SEQUENCE>7
    <FILENAME>image101.jpg
    <TEXT>
    Document 7 - file: image101.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>image81.jpg
    <TEXT>
    Document 8 - file: image81.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>image91.jpg
    <TEXT>
    Document 9 - file: image91.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>logoa071.jpg
    <TEXT>
    Document 10 - file: logoa071.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>p11.jpg
    <TEXT>
    Document 11 - file: p11.jpg

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    <DOCUMENT>
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    <SEQUENCE>12
    <FILENAME>proxycard1a.jpg
    <TEXT>
    Document 12 - file: proxycard1a.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>proxycard21a.jpg
    <TEXT>
    Document 13 - file: proxycard21a.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>proxycard31a.jpg
    <TEXT>
    Document 14 - file: proxycard31a.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>signatureofjuliecoletti1.jpg
    <TEXT>
    Document 15 - file: signatureofjuliecoletti1.jpg

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    </SEC-DOCUMENT>