1986 All-Ireland Under-21 Football Championship
| Championship details | |
|---|---|
| All-Ireland Champions | |
| Winning team | Cork (7th win) |
| Captain | Mick Slocum |
| All-Ireland Finalists | |
| Losing team | Offaly |
| Provincial Champions | |
| Munster | Cork |
| Leinster | Offaly |
| Ulster | Derry |
| Connacht | Mayo |
The 1986 All-Ireland Under-21 Football Championship was the 23rd 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.
On 14 September 1986, Cork won the championship following a 3-16 to 0-12 defeat of Offaly in the All-Ireland final. This was their seventh All-Ireland title overall and their third in successive seasons.