Illzach (French pronunciation: [ilzak] ⓘ), in Alsatian Ìllzig (Alemannic German pronunciation: [ˈɪltsik]) is a commune in the Haut-Rhin department in Alsace in north-eastern France.

It is located in the north side of the Mulhouse metropolitan area, and forms part of the Mulhouse Alsace Agglomération, the inter-communal local government body for that area.

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