1977 All-Ireland Under-21 Football Championship
| Championship details | |
|---|---|
| All-Ireland Champions | |
| Winning team | Kerry (5th win) |
| Captain | Denis "Ógie" Moran |
| Manager | Mick O'Dwyer |
| All-Ireland Finalists | |
| Losing team | Down |
| Provincial Champions | |
| Munster | Kerry |
| Leinster | Offaly |
| Ulster | Down |
| Connacht | Leitrim |
The 1977 All-Ireland Under-21 Football Championship was the 14th 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 2 October 1977, Kerry won the championship following a 1-11 to 1-5 defeat of Down in the All-Ireland final. This was their fifth All-Ireland title overall and their third in successive championship seasons.