2021 All-Ireland Under-20 Football Championship
| Championship details | |
|---|---|
| Dates | 1 July – 15 August 2021 |
| Teams | 31 |
| All-Ireland Champions | |
| Winning team | Offaly (2nd win) |
| Captain | Kieran Dolan |
| Manager | Declan Kelly |
| All-Ireland Finalists | |
| Losing team | Roscommon |
| Captain | Colin Walsh |
| Manager | Liam Tully |
| Provincial Champions | |
| Munster | Cork |
| Leinster | Offaly |
| Ulster | Down |
| Connacht | Roscommon |
| Championship statistics | |
| No. matches played | 30 |
| Goals total | 91 (3.03 per game) |
| Points total | 667 (22.23 per game) |
| Top Scorer | Jack Bryant (4–22) |
| Player of the Year | Jack Bryant |
← 2020 2022 → | |
The 2021 All-Ireland Under-20 Football Championship was the fourth staging of the All-Ireland Under-20 Championship and the 58th staging overall of a Gaelic football championship for players between the minor and senior grades. The competition began on 1 July and ended on 15 August 2021.
The defending champion was Galway; however, the team was beaten by Mayo after a penalty shootout in the Connacht semi-final.
The final was played on 15 August 2021 at Croke Park in Dublin, between Offaly and Roscommon, in what was their first ever championship meeting. Offaly won the match by 1-14 to 1-11 to claim a second title and a first title since 1988.