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.
The final was played on 6 October 1991 at Páirc Uí Chaoimh 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 0-11 to 0-10 to claim their third championship title overall and a second title in succession..[2][3]