| All-Ireland Champions | |
|---|---|
| Winning team | Dublin (12th win) |
| Provincial Champions | |
| Leinster | Dublin |
| Ulster | Monaghan |
| Connacht | Mayo |
| Championship statistics | |
|
← 1920
1922 →
|
|
The 1921 All-Ireland Senior Football Championship was the 35th staging of Ireland's premier Gaelic football knock-out competition. Dublin were the winners.
The championship was not held due to the Irish Civil War. Tipperary were chosen to represent the province.