The 2015 Men's League1 Ontario season was the second season of play for League1 Ontario, a Division 3 semi-professional soccer league in the Canadian soccer pyramid and the highest level of soccer based in the Canadian province of Ontario. This season saw the return of all nine teams which completed the previous season, as well as the addition of three new teams for the Men's Division. The 2015 season also marked the birth of League1 Ontario's Women's Division, which began play with seven teams.