Carignan (French pronunciation: [kaʁiɲɑ̃] ⓘ) 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.

On June 6, 1871, a large part of Saint-Joseph-de-Chambly broke apart (as well as an important section of Saint-Bruno-de-Montarville) to form the new town of Saint-Basile-le-Grand.

Carignan is made up of small urban blocks surrounded by agricultural land where the main crops grown are corn, wheat and soybeans.

The municipality borders the Acadia and Richelieu Rivers and these merge, creating a small delta.

Unusual fact, the municipality is cut (to the east and west) by the city of Chambly in two non-contiguous portions: there is a discontinuity of 1.8 km on the chemin de la Grande-Ligne and 3 km by the Richelieu River.