| Province: | Quebec |
| Fed-Status: | defunct |
| Fed-District-Number: | 24015 |
| Fed-Created: | 2003 |
| Fed-Abolished: | 2012 |
| Fed-Election-First: | 2004 |
| Fed-Election-Last: | 2011 |
| Demo-Pop-Ref: | [1] |
| Demo-Area-Ref: | [2] |
| Demo-Census-Date: | 2011 |
| Demo-Pop: | 113459 |
| Demo-Electors: | 84347 |
| Demo-Electors-Date: | 2011 |
| Demo-Area: | 300.30 |
| Demo-Cd: | Roussillon RCM |
| Demo-Csd: | Châteauguay, Delson, Léry, Mercier, Saint-Constant, Saint-Isidore, Sainte-Catherine |
Châteauguay—Saint-Constant was a federal electoral district in Quebec, Canada, that was represented in the House of Commons of Canada from 2004 to 2015. Its population in 2006 was 107,165.
Châteauguay—Saint-Constant was created in 2003 from Châteauguay riding, with the exception of a portion of Châteauguay that was transferred in Beauharnois—Salaberry and Saint-Jean ridings.
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: