| Clare Under-21A Football Championship | |
|---|---|
| Irish | Craobh Fé-21A Peile an Chláir |
| Founded | 1964 |
| Trophy | John Marrinan Cup |
| Title holders |  Ennistymon (4th title) |
| Most titles |  Kilmurry Ibrickane (13 titles) |
| Sponsors | Berwick Callinan Murphy Solicitors |
TheClare Under-21A Football Championship (abbreviated toClare 21AFC) is an annualGAA club competition organised by theClare County Board between the top-ranking under-21gaelic football clubs inCounty Clare,Ireland.
The winners of the Clare 21AFC are presented with theJohn Marrinan Cup.
The current (2025) champions areEnnistymon who defeatedClondegad by 3-07 to 0-08, to win their third title in four years, and fourth overall.
| # | Club | Wins | Years won |
|---|---|---|---|
| 1. | Kilmurry Ibrickane | 13 | 1966, 1983, 1984, 1995, 1996, 1998, 2001, 2003, 2004, 2005, 2006, 2007, 2016 |
| 2. |  Kilmihil | 7 | 1968, 1980, 1981, 1982, 1987, 2019(withShannon Gaels), 2021(as Cill Cúil Gaels) |
| 3. |  Shannon Gaels, Labasheeda | 6 | 1967, 1969, 1997, 1999, 2019(withKilmihil), 2021(as Cill Cúil Gaels) |
| 4. |  Cooraclare | 5 | 1972, 1986, 1988, 1991, 2017 |
| Éire Óg, Ennis | 2000, 2013, 2014, 2015, 2018 | ||
 St. Joseph's, Miltown Malbay | 1970, 1971, 1977, 1978, 2002(withLiscannor) | ||
 St. Senan's, Kilkee | 1976, 1979, 1989, 1992, 1993 | ||
| 8. | Ennistymon | 4 | 2010, 2022, 2023, 2025 |
| 9. |  Doonbeg | 3 | 1964, 1965, 1974 |
| 10. | Cratloe | 2 | 2009, 2011 |
 Kilrush Shamrocks | 1975, 1994 | ||
 St. Joseph's, Doora-Barefield | 2008, 2024 | ||
| 13. |  Clondegad | 1 | 2012 |
 Coolmeen | 2021(as Cill Cúil Gaels) | ||
| Kildysart | 2021(as Cill Cúil Gaels) | ||
| Liscannor | 2002(withMiltown Malbay) | ||
| St. Breckan's, Lisdoonvarna | 1985 | ||
| St. Michael's | 1973 | ||
| Wolfe Tones, Shannon | 1990 |