2021 All-Ireland Under-20 Football Championship
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.
Statistics
Top scorers
;Top scorers overall| Rank | Player | County | Tally | Total | Matches | Average |
| 1 | Jack Bryant | Offaly | 4-22 | 34 | 5 | 6.80 |
| 2 | Daire Cregg | Roscommon | 0-28 | 28 | 5 | 5.60 |
| 3 | James Fitzpatrick | Roscommon | 5-07 | 22 | 5 | 4.40 |
| 3 | Adam McDermott | Roscommon | 4-10 | 22 | 5 | 4.40 |
| 5 | Seán O'Connor | Tipperary | 2-15 | 21 | 3 | 7.00 |
| 6 | Ben McGauren | Westmeath | 1-17 | 20 | 3 | 6.66 |
| 7 | David Buckley | Cork | 0-18 | 18 | 3 | 6.00 |
| 8 | Andrew Gilmore | Down | 2-08 | 14 | 4 | 3.50 |
| 9 | Fionn Murray | Dublin | 1-10 | 13 | 3 | 4.33 |
| 9 | Ben O'Carroll | Roscommon | 1-10 | 13 | 5 | 2.60 |
;Top scorers in a single game
| Rank | Player | County | Tally | Total | Opposition |
| 1 | Ben McGauren | Westmeath | 1-10 | 13 | Kildare |
| 2 | Tom O'Connell | Waterford | 3-01 | 10 | Clare |
| 2 | Conor Corbett | Cork | 2-04 | 10 | Kerry |
| 2 | Jack Bryant | Offaly | 2-04 | 10 | Cork |
| 2 | David Buckley | Cork | 0-10 | 10 | Tipperary |
| 6 | Donnach Swinburne | Monaghan | 3-00 | 9 | Donegal |
| 6 | Jack Duggan | Longford | 1-06 | 9 | Westmeath |
| 6 | Daire Cregg | Roscommon | 0-09 | 9 | Leitrim |
| 9 | Seán O'Connor | Tipperary | 2-02 | 8 | Cork |
| 9 | James Fitzpatrick | Roscommon | 2-02 | 8 | Sligo |
| 9 | Jay Hughes | Louth | 2-02 | 8 | Longford |
| 9 | Keelin McGann | Longford | 1-05 | 8 | Louth |
| 9 | Shane Pettit | Wexford | 1-05 | 8 | Offaly |
| 9 | Seán Jones | Monaghan | 0-08 | 8 | Down |