Ontario Soccer League
| Country | Canada |
|---|---|
| Confederation | CONCACAF |
| Number of clubs | 10 |
| Relegation to | OSL Regional Divisions |
| Domestic cup(s) | Challenge Trophy |
| Current champions | Durham Celtic FC (2017) |
The Ontario Soccer League (OSL) is a competitive amateur soccer league in Ontario, Canada. The OSL is affiliated with and governed by the Ontario Soccer Association. According to the OSA, the OSL has Provincial Leagues, Regional Leagues and Multi-Jurisdictional Leagues.
The league is divided into 12 regional divisions. It can be considered part of Canada's fifth tier in soccer, with teams eligible to compete for the Challenge Trophy.