| 1987 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: | Donegal (2nd win) |
| Label6: | Captain |
| Data6: | John Cunningham |
| Label7: | Manager |
| Header8: | All-Ireland Finalists |
| Label9: | Losing team |
| Data9: | Kerry |
| Label10: | Captain |
| Label11: | Manager |
| Header12: | Provincial Champions |
| Label13: | Munster |
| Data13: | Kerry |
| Label14: | Leinster |
| Data14: | Laois |
| Label15: | Ulster |
| Data15: | Donegal |
| Label16: | Connacht |
| Data16: | Galway |
The 1987 All-Ireland Under-21 Football Championship was the 24th 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 Tipperary in the Munster semi-final.
On 28 June 1987, Donegal won the championship following a 1–12 to 2–4 defeat of Kerry in an All-Ireland final replay.[1] This was their second All-Ireland title overall and their first in five championship seasons; the following players won the Sam Maguire Cup with their county in 1992: Manus Boyle, John Cunningham, John Joe Doherty, Barry McGowan and Tommy Ryan; Boyle scored 1–7 in the final; Sean Bonner (brother of Declan) was in the full-back line; the losing Kerry team featured Mick Galwey, who scored a goal.[2]