The 1991 Cork Senior Football Championship was the 103rd staging of the Cork Senior Football Championship since its establishment by the Cork County Board in 1887. The draw for the opening fixtures took place on 16 December 1990. The championship ran from 20 April to 6 October 1991.
Duhallow entered the championship as the defending champions.
The final was played on 6 October 1991 at Páirc UàChaoimh in Cork, between Duhallow and St. Finbarr's, in what was their third ever meeting in the final and their second meeting in succession. Duhallow won the match by 0âÂÂ11 to 0âÂÂ10 to claim their third championship title overall and a second title in succession.
University College Cork's Maurice Fitzgerald was the championship's top scorer with 2âÂÂ16.
Promoted from the Cork Intermediate Football Championship
Regraded to the Cork Intermediate Football Championship