Back بطولة الدوري الأمريكي الدرجة الأولى Arabic USL League One German USL League One Spanish USL League One French USL League One Italian USLリーグ1 Japanese USL 리그 1 Korean USL League One Portuguese Лига один ЮСЛ Russian USL League One Turkish
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| Organizing body | United Soccer League |
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| Founded | April 2, 2017 |
| First season | 2019 |
| Country | United States |
| Confederation | CONCACAF (North American Football Union) |
| Number of teams | 12 |
| Level on pyramid | 3 |
| Domestic cup(s) | U.S. Open Cup |
| League cup(s) | USL Cup |
| Current champion(s) | North Carolina FC (2023) |
| Current Players' Shield | Union Omaha (2024) |
| Most championships | Greenville Triumph SC North Carolina FC North Texas SC Union Omaha South Georgia Tormenta FC (1 title each) |
| Most Players' Shields | Union Omaha (3 titles) |
| Top goalscorer | Emiliano Terzaghi (55) |
| TV partners | |
| Website | www |
| Current: 2024 USL League One season | |
| United Soccer League divisions |
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| Men's leagues |
| Women's leagues |
| Youth leagues |
USL League One (USL1) is a professional men's soccer league in the United States that had its inaugural season in 2019. The Division III league is operated by United Soccer League, the same group that operates the Division II USL Championship and other leagues. As of 2024,[update] the league has 12 teams who play 22 regular season games, followed by playoffs. All teams also participate in the USL Cup, adding an additional eight games, followed by knockout rounds.