Richelieu (French: [ʁiʃ(ə)ljø] ⓘ) is a city in Rouville Regional County Municipality, in the province of Quebec, Canada.

Its name comes from the fact that it lies along the Richelieu River.

[5] Population trend:[6] Richelieu amalgamated with Municipality of Notre-Dame-de-Bon-Secours on March 15, 2000.

The CIT Chambly-Richelieu-Carignan provides commuter and local bus services.

The South Shore Protestant Regional School Board previously served the municipality.