League1 Ontario
| Organising body | Ontario Soccer Association |
|---|---|
| Founded | November 15, 2013 |
| First season | 2014 |
| Country | Canada |
| Province | Ontario |
| Confederation | CONCACAF (North American Football Union) |
| Number of clubs | 11 (Premier) 12 (Championship) 25 (L2O) |
| Level on pyramid | 3 |
| Domestic cup(s) | Canadian Championship |
| League cup(s) | L1 Cup |
| International cup(s) | CONCACAF Champions Cup (via Canadian Championship) |
| Current champions | Scrosoppi FC (2024) |
| Current L1 Cup | Vaughan Azzurri (2024) |
| Most championships | Vaughan Azzurri (3 titles) |
| Most L1 Cups | Vaughan Azzurri (4 titles) |
| Website | www |
| Current: 2025 League1 Ontario season | |
League1 Ontario (L1ON) is a semi-professional men's soccer league in Ontario, Canada. The league is sanctioned by the Canadian Soccer Association and the Ontario Soccer Association.
League1 Ontario consists of three tiers – League1 Premier, League1 Championship, and League2 Ontario – with promotion and relegation between them. The top-two tiers consist of 12 teams each, while the lowest tier is uncapped in size.
In the Canadian soccer league system, the men's division is behind the fully-professional Canadian Premier League. It is part of League1 Canada, the national third tier with regional division, along with three other provincial leagues. The league champion qualifies for the Canadian Championship, Canada's domestic cup tournament. Dino Rossi serves as the commissioner of the league.