RFL League One
| Sport | Rugby league |
|---|---|
| Founded |
|
| Ceased | 2025 (merged with Betfred Championship) |
| No. of teams | 10 |
| Country | |
| Last champion | North Wales Crusaders (2nd title) |
| Most titles | Dewsbury Rams (3 titles) |
| Level on pyramid | 3 |
| Promotion to | Championship |
| Domestic cups | Challenge Cup 1895 Cup |
| Official website | League One |
The Rugby Football League's League One (known as the Betfred League One) was the third-highest division of rugby league in Britain. It was 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 league was disbanded at the conclusion of 2025 due to the merger of the Championship and League One for the 2026 season.