The French River is a river in Central Ontario, Canada. It flows from Lake Nipissing west to Georgian Bay. The river largely follows the boundary between the Parry Sound District and the Sudbury District, and in most contexts is considered the dividing line between Northern Ontario and Southern Ontario. The French River was designated a Canadian Heritage River in 1986.

French River, also known as Rivière-des-Français, is a municipality in the Canadian province of Ontario, in the Sudbury District. The municipality had a population of 2,442 in the Canada 2011 Census. It was formed in 1999 out of unincorporated portions of the Unorganized North Sudbury District, and named after the French River that flows through the municipality.