Châteauguay—Saint-Constant (French pronunciation: [ʃatoɡɛ sɛ̃ kɔ̃stɑ̃]) was a federal electoral district in Quebec, Canada, that was represented in the House of Commons of Canada from 2004 to 2015.

The district included all of the Regional County Municipality of Roussillon including Kahnawake Indian Reserve No.

14, but excluding the cities of Candiac and La Prairie and the Municipality of Saint-Philippe in the east of the county municipality.

The neighbouring ridings were Vaudreuil—Soulanges, Beauharnois—Salaberry, Brossard—La Prairie, LaSalle—Émard, Notre-Dame-de-Grâce—Lachine, and Lac-Saint-Louis.

This riding has elected the following members of parliament: