Thirty-one county teams from the island of Ireland, plus London, competed; Kilkenny do not participate.
For the first time ever, there was no Leinster team in the top tier of the league after Dublin and Kildare were both relegated on the last day of the 2022 season.
[1][2][3] For the 2023 season, league position was also important for the All-Ireland Championship; 7 of the teams that reach the All-Ireland round robin stage were selected based on league finish.
Teams compete for promotion and relegation to a higher or lower league.
As per the Official GAA Guide - Part 1 - Section 6.21[6] - If two teams in the same group are equal on points on completion of the league phase, the following tie-breaking criteria are applied: If three or more teams in the same group are equal on points on completion of the league phase, the following tie-breaking criteria are applied: In the event that two teams or more finish with equal points, but have been affected by a disqualification, loss of game on a proven objection, retirement or walkover, the tie shall be decided by the following means: