| Matches: | 18 |
| Trophy: | O'Byrne Cup |
| Province: | Leinster |
| Year: | 2019 |
| Manager: | Jack Cooney |
| Winners: | Westmeath |
| Ordinal: | 4 |
| Runnersup: | Dublin |
| Runnerupmanager: | Paul Clarke |
| Next: | 2020 |
The 2019 O'Byrne Cup was played by county teams of Leinster GAA in December 2018 and January 2019.[1]
The draw took place on 26 September 2018.[2]
Several new rules are being trialled in the competition:
One team (Dublin) received a bye to the semi-finals. The remaining ten teams were drawn to play in one group of four teams and two groups of three teams.
In the four-team group, each team plays the other teams in their group once. Two points are awarded for a win and one for a draw.
In the two three-team groups, each team played the other teams in their group once. Each team also played one game against a team from the other three-team group. Two points are awarded for a win and one for a draw.
The three group winners advanced to the semi-finals.
The three teams in Group 2 play the three teams in Group 3 with each team having a single game.
The three group winners plus the team given a bye (Dublin) compete in the semi-finals. The two winners advance to the final.