The IRFU Women's Interprovincial Series, previously known as the IWRFU Interprovincial Championship, is the top level women's rugby union competition in Ireland.

The competition takes place every December and features four teams representing Connacht, Leinster, Munster and Ulster.

[1][2] The competition effectively acts as a selection trials process for the Ireland women's national rugby union team that competes in the subsequent Women's Six Nations Championship.

[1] In recent seasons, the competition has also featured playoffs and a final.

[5][6][7] ^ Munster win title due to superior points table difference ^^ Both sides finished the campaign with two wins and a loss but Leinster's superior scoring difference +52 during round-robin (Connaught's +26) ^* Both sides finished the campaign with two wins and a draw but Leinster's superior scoring difference +64 during round-robin (Munster's +37) Source:[1]