2025 Ulster Senior Football Championship

The 2025 Ulster Senior Football Championship was the 137th instalment of the annual Ulster Senior Football Championship organised by Ulster GAA. It was one of the four provincial competitions of the 2025 All-Ireland Senior Football Championship. The draw for the championship was made on 12 October 2024. Donegal retained their title by beating Armagh in the final on 10 May.

Antrim v Armagh dispute

At the draw made in October 2024, Antrim was drawn first against defending All-Ireland champions Armagh, granting them home advantage; however, Ulster GAA stated that Antrim's proposed home ground Corrigan Park, with its capacity of less than 4,000 would be unsuitable to host the match. Instead, Ulster GAA initially fixed the game for Páirc Esler, the home ground of Down GAA, but a stadium located primarily in County Armagh.
A campaign by Antrim GAA, alongside support from the Gaelic Players Association, which included a threatened boycott of the game, was ultimately successful, with Ulster GAA agreeing to host the game at the West Belfast venue.