Saint-Constant is a city in southwestern Quebec, Canada. It is located on the south shore of Montreal in the Roussillon Regional County Municipality of the Montérégie region. The population as of the Canada 2016 Census was 27,359.

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.