The Canadian Soccer League is a semi-professional league for Canadian soccer clubs primarily located in the province of Ontario, and claims the history of the Canadian National Soccer League (CNSL). It is a non-FIFA league previously sanctioned by the Canadian Soccer Association (CSA), but now affiliated with the Soccer Federation of Canada (SFC). As of 2023, it consists of seven teams, all located in Ontario. The season usually runs from May to October, with most games played on the weekend followed by a playoff format to determine the overall champion.

The National Soccer League was a soccer league in Canada that existed from 1926 to 1997. Teams were primarily based in the provinces of Ontario and Quebec. The league was renamed to Canadian National Soccer League in 1993 following the folding of the Canadian Soccer League, and the accepting of the Winnipeg Fury, making the league more national. In the 1960s, the Canadian National Soccer League was one of four major leagues in Canadian soccer alongside the Pacific Coast League, the Eastern Canada Professional Soccer League and the Western Canada Soccer League.