2009 All-Ireland Under-21 Football Championship
| Championship details | |
|---|---|
| All-Ireland Champions | |
| Winning team | Cork (11th win) |
| Captain | Colm O'Neill |
| All-Ireland Finalists | |
| Losing team | Down |
| Provincial Champions | |
| Munster | Cork |
| Leinster | Dublin |
| Ulster | Down |
| Connacht | Mayo |
The 2009 All-Ireland Under-21 Football Championship was the 46th staging of the All-Ireland Under-21 Football Championship since its establishment by the Gaelic Athletic Association in 1964.
Kerry entered the championship as defending champions, however, they were defeated by Cork in the Munster quarter-final.
On 4 May 2009, Cork won the championship following a 1-13 to 2-9 defeat of Down in the All-Ireland final. This was their 11th All-Ireland title overall and their first in two championship seasons.