Mont-Saint-Hilaire is a suburb of Montreal on the South Shore of southeastern Quebec, Canada, on the Richelieu River in the Regional County Municipality of La Vallée-du-Richelieu. The population as of the Canada 2021 Census was 18,859. The city is named after the Mont Saint-Hilaire.

The South Shore is the general term for the suburbs of Montreal, Quebec located on the southern shore of the Saint Lawrence River opposite the Island of Montreal. The South Shore is located within the Quebec administrative region of Montérégie.