Sligo Under 21 Football Championship
The Sligo Under-21 Football Championship is an annual Gaelic Athletic Association competition between the Under-21 panels of the clubs in Sligo. Up to 2006 this was the Under-21 Championship, but a decision was taken to hold the Championship a year earlier, therefore there were two Championships in 2006 - an Under-21 Championship, and the Under-20 competition, in which Tourlestrane defeated Eastern Harps in the final. No competition was held in 2014 as it was decided to re-instate the competition in its Under-21 format for 2015. An amalgamated team of Easkey / Enniscrone are the current champions.
Top winners
| # | Club | Wins | Years won | Last final lost |
| 1 | St Mary's | 9 | 1985, 1986, 2000, 2012, 2013, 2015, 2016, 2018, 2025 | 2001 |
| 2 | Tubbercurry | 7 | 1978, 1979, 1980, 1981, 1983, 2007, 2017 | 2013 |
| 3 | Shamrock Gaels | 4 | 1975, 1987, 1988, 1989 | 2018 |
| 4 | Tourlestrane | 3 | 1976, 2006, 2008 | 2017 |
| 4 | Eastern Harps | 3 | 1994, 1998, 2001 | 2025 |
| 4 | Curry | 3 | 1996, 2004, 2005 | 2011 |
| 5 | Coolera/Strandhill | 2 | 2002, 2009 | 2012 |
| 5 | Owenmore Gaels | 2 | 1982, 1984 | n/a |
| 5 | St Nathy's | 2 | 1992, 1993 | n/a |
| 5 | Easkey/St. Farnan's | 2 | 1995, 1997 | 2010 |
| 5 | Ballymote | 2 | 2003, 2006 | n/a |
| 6 | Grange | 1 | 1977 | 1976 |
| 6 | Enniscrone | 1 | 1990 | n/a |
| 6 | Drumcliffe–Rosses Point | 1 | 1991 | 1992 |
| 6 | Easkey / Enniscrone | 1 | 2019 | 2016 |
| 6 | Calry/St. Joseph's | 1 | 2010 | n/a |
| 6 | St. John's | 1 | 2011 | n/a |
| 6 | St. Molaise Gaels | 1 | 2021 | 2022 |
| 6 | Bunninadden/Ballymote | 1 | 2022 | 2021 |
Roll of Honour (Under-20/21 'A' Championship)
Note - 1975-2006: Under-21, 2006–2013: Under-20, no competition in 2014, 2015–present: Under-21.Divisional winners
County Champions shown in bold type.Roll of Honour (Under-20/21 'B' Championship)
Note - 1998-2006: Under-21, 2006–present: Under-20.| Year | Winner | Score | Opponent | Score |
| 2025 | Castleconnor | 5-16 | Owenmore Gaels | 0-15 |
| 2022 | Curry | 1-07 | Tubbercurry/Cloonacool | 0-06 |
| 2009 | St Mary's | 1-06 | Bunninadden | 0-06 |
| 2008 | Shamrock Gaels | 0-08 | Drumcliffe–Rosses Point | 0-05 |
| 2007 | St. Patrick's, Dromard | 2-14 | Bunninadden | 1-06 |
| 2006 | Naomh Molaise Gaels | 0-06, 3-05 | Curry | 0-06, 0-11 |
| 2006 | Naomh Molaise Gaels | 3-06 | Coolera/Strandhill | 1-06 |
| 2005 | St. Farnan's | w/o | Tubbercurry | scr. |
| 2004 | St. John's | 2-06 | Calry/St. Joseph's | 1-05 |
| 2003 | Shamrock Gaels | 0-14 | Calry/St. Joseph's | 1-08 |
| 2002 | Ballymote | 2-08, 1-08 | Bunninadden | 1-11, 1-04 |
| 2001 | Tubbercurry | 2-14 | Cloonacool | 0-09 |
| 2000 | Drumcliffe–Rosses Point | 3-08 | Bunninadden | 2-02 |
| 1999 | No competition |