Leinster Senior League Senior 1a Sunday

The Leinster Senior League Senior 1A Sunday is an amateur football league in Ireland. It is the top division of the Leinster Senior League, and is played on Sundays. The league consists of 12 teams, and the season runs from August to May.

The current champions are Usher Celtic, who won the title in the 2022/23 season. Other recent champions include Arklow Town FC (2021/22), Crumlin United (2020/21), and St. Mochta's (2019/20).