1980 O'Byrne Cup

The 1980 O'Byrne Cup was a Gaelic football competition contested by the county teams of Leinster GAA. It was the 22nd staging of the competition that was first held in 1954, with the aim of starting a fund for injured footballers. It was reintroduced to the GAA calendar in 1980 after not being held since 1978.

Louth won the competition after defeating Dublin in the final, played at St Brigid's Park in Dundalk.

Format
The 12 participating counties were split into three groups, with the best four performing teams qualifying for the semi-final stage.