| Tournament details | |
|---|---|
| Province | Leinster |
| Year | 2005 |
| Trophy | O'Byrne Cup |
| Winners | |
| Champions | Laois (5th win) |
| Manager | Mick O'Dwyer |
| Captain | Noel Garvan |
| Runners-up | |
| Runners-up | Westmeath |
| Manager | Páidí Ó Sé |
| Captain | Michael Ennis |
The 2005 O'Byrne Cup was a Gaelic football competition played by the teams of Leinster GAA. The competition differs from the Leinster Senior Football Championship as it also features further education colleges. It was won by Laois.[1][2][3][4]