RFL 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.