The 1963 O'Byrne Cup was a Gaelic football tournament contested by the county teams of Leinster GAA. It was the 10th staging of the competition that was first held in 1954, with the aim of starting a fund for injured footballers.
Louth won the competition after defeating Longford in the final, played at the Gaelic Grounds in Drogheda.
The tournament was contested on a knockout basis. First-round byes were awarded to Dublin, Louth, Meath and Westmeath.