The 2015 Canadian Soccer League season was the 18th since its establishment where a total of 22 teams from Ontario took part in the league. The season began on May 9, 2015, and concluded on October 25, 2015. Toronto Croatia won their sixth championship (ninth including Canadian National Soccer League titles) in a 1–0 victory over SC Waterloo in the CSL Championship final held at Warrior Field in Waterloo, Ontario. In the regular season, the Serbian White Eagles clinched their fourth regular-season title, while Milton SC won their first second division championship.