Carignan is a suburban municipality in southwestern Quebec, Canada, on the Richelieu River in La Vallée-du-Richelieu Regional County Municipality, about 27 km (17 mi) from Montreal. The population as of the Canada 2021 Census was 11,740.

The Richelieu River is a river of Quebec, Canada, and a major right-bank tributary of the St. Lawrence River. It rises at Lake Champlain, from which it flows northward through Quebec and empties into the St. Lawrence. It was formerly known by the French as the Iroquois River and the Chambly River, and was named for Cardinal Richelieu, the powerful minister under Louis XIII.