| 1990 All-Ireland Under-21 Football Championship | |
| Bodyclass: | vevent |
| Headerstyle: | background:#BFD7FF; |
| Labelstyle: | white-space: nowrap |
| Datastyle: | white-space: nowrap |
| Header1: | Championship details |
| Label2: | Dates |
| Label3: | Teams |
| Header4: | All-Ireland Champions |
| Label5: | Winning team |
| Data5: | Kerry (6th win) |
| Label6: | Captain |
| Data6: | Vincent Knightley |
| Label7: | Manager |
| Header8: | All-Ireland Finalists |
| Label9: | Losing team |
| Data9: | Tyrone |
| Label10: | Captain |
| Label11: | Manager |
| Header12: | Provincial Champions |
| Label13: | Munster |
| Data13: | Kerry |
| Label14: | Leinster |
| Data14: | Meath |
| Label15: | Ulster |
| Data15: | Tyrone |
| Label16: | Connacht |
| Data16: | Galway |
The 1990 All-Ireland Under-21 Football Championship was the 27th staging of the All-Ireland Under-21 Football Championship since its establishment by the Gaelic Athletic Association in 1964.
Cork entered the championship as defending champions, however, they were defeated by Kerry in the Munster final.
On 13 May 1990, Kerry won the championship following a 5–12 to 2–11 defeat of Tyrone in the All-Ireland final.[1] This was their sixth All-Ireland title overall and their first in 13 championship seasons.
Semi-finals
Final