| Championship details | |
|---|---|
| All-Ireland Champions | |
| Winning team | Tyrone (1st win) |
| Captain | Peter Canavan |
| All-Ireland Finalists | |
| Losing team | Kerry |
| Provincial Champions | |
| Munster | Kerry |
| Leinster | Meath |
| Ulster | Tyrone |
| Connacht | Leitrim |
The 1991 All-Ireland Under-21 Football Championship was the 28th 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.
On 12 May 1991, Tyrone won the championship following a 4-16 to 1-5 defeat of Kerry in the All-Ireland final.[1] This was their first All-Ireland title.