The Celtic Challenge is a cross-border women's rugby union competition that will be held annually, launched in 2023.

Designed to develop players for the Celtic nations of Ireland, Scotland and Wales, the inaugural pilot edition featured a double round robin between three teams, one from each participating union.

[1][2] Beginning with the 2024–25 season, the competition will maintain its six-team setup, transitioning into a full home-and-away round-robin format.

The winners and runners up of each edition are listed below: The first edition consisted of six matches in a double round robin:[10][11] The competition involved 3 teams: In November 2023 it was announced that for the second season, the competition would expand to six teams and twenty one matches.

[12] In December it was announced that the 2023–24 competition will run from December to March 2024 and will be contested by six teams: The teams will play each other once, either home or away, across five rounds before play-offs to decide a champion in March 2024.