Kingstone Press League 1 is a professional rugby league competition based in England and acts as the third tier below the Super League and Championship. The competition also features clubs from Canada and Wales.
The league was inaugurated in 2003 when the Northern Ford Premiership was divided into two separate leagues, initially named National League One and National League Two. In 2009, the league names were changed to the Championship and Championship 1 respectively, with the latter adopting its current name of League 1 in 2015.
Under the current structure, the 16 clubs play a regular season of 15 rounds. Following the conclusion of their regular league seasons, the 16 clubs then compete in a play-off series where they split into 2 divisions of 8 based upon league position.
The top 8 compete in the League 1 Super 8s. They play each other once (either home or away) to determine which 5 clubs will compete in the play-offs. From this, two teams are promoted to the Kingstone Press Championship. The remaining (bottom 8) clubs compete for the League 1 Shield.