Current season, competition or edition: 2025 RFL League One | |
 | |
| Sport | Rugby league |
|---|---|
| Founded | 2003 |
| No. of teams | 11 |
| Country |  England Wales |
| Most recent champion(s) |  Oldham (2nd title) |
| Most titles |  Dewsbury Rams (3 titles) |
| Level on pyramid | 3 |
| Promotion to | Championship |
| Domestic cup(s) | Challenge Cup 1895 Cup |
| Official website | League One |
The Rugby Football League's League One (known as the Betfred League One) is the third-highest division of rugby league in Britain. It is also the lowest level of professional rugby league in Britain.
Introduced in 2003 as National League 2 it was the first time British rugby league had a third tier since the old Third and Second Divisions merged in 1998. The league was rebranded as Championship 1 in 2009, then League 1 in 2015, and League One in 2022.
The current winners are Oldham who won the league in 2024.