Sainte-Catherine is an off-island suburb of Montreal, in southwestern Quebec, Canada, on the St. Lawrence River in the Regional County Municipality of Roussillon. The population as of the Canada 2011 Census was 16,762.

Greater Montreal is the most populous metropolitan area in Quebec and the second most populous in Canada after Greater Toronto. In 2015, Statistics Canada identified Montreal's Census Metropolitan Area (CMA) as 4,258.31 square kilometres (1,644.14 sq mi) with a population of 4,027,100, almost half that of the province.