| Tournament details | |
|---|---|
| Province | Leinster |
| Year | 1990 |
| Trophy | O'Byrne Cup |
| Date | 7 April — 23 May |
| Teams | 11 |
| Winners | |
| Champions | Louth (3rd win) |
| Manager | Frank Lynch |
| Captain | Gerry Farrell |
| Runners-up | |
| Runners-up | Kildare |
| Manager | Pat Fitzgerald |
The 1990 O'Byrne Cup was a Gaelic football competition contested by the county teams of Leinster GAA.
The tournament format was straight knockout, with 11 participating teams. Dublin did not enter the competition. First-round byes were awarded to Laois, Louth, Meath, Longford and Kildare.
Louth won the competition after defeating Kildare in the final, held at the Drogheda Gaelic Grounds.
| First round 7 - 14 April | Quarter-finals 14 - 18 April | Semi-finals 21 - 25 April | Final 23 May | ||||||||||||||||
 Wexford | 3-09 | ||||||||||||||||||
 Wicklow | 0-04 | Wexford | 0-12 | ||||||||||||||||
 Laois | 2-05 | ||||||||||||||||||
| Wexford | 1-04 | ||||||||||||||||||
 Carlow | 2-13 |  Kildare | 2-11 | ||||||||||||||||
 Kilkenny | 1-06 | Carlow | 1-09 | ||||||||||||||||
| Kildare | 1-12 | ||||||||||||||||||
| Kildare | 1-06 | ||||||||||||||||||
 Westmeath | 0-11 |  Louth | 2-04 | ||||||||||||||||
 Offaly | 0-11 | Louth | 1-12 | ||||||||||||||||
 Meath | 2-06 | ||||||||||||||||||
| Louth | 2-11 | ||||||||||||||||||
| Westmeath | 1-08 | Longford | 1-13 | ||||||||||||||||
| Offaly | 1-07 | Westmeath | 1-09 | ||||||||||||||||
| Longford | 2-08 | ||||||||||||||||||
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