The Clare Under-21<small>A</small> Football Championship (abbreviated to Clare 21<small>A</small>FC) is an annual GAA club competition organised by the Clare County Board between the top-ranking under-21 gaelic football clubs in County Clare, Ireland.
The winners of the Clare 21<small>A</small>FC are presented with the John Marrinan Cup.
The current (2025) champions are Ennistymon who defeated Clondegad by 3-07 to 0-08, to win their third title in four years, and fourth overall.