The 1991 Cork Senior Hurling Championship was the 103rd staging of the Cork Senior Hurling 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 began on 28 April 1991 and ended on 22 September 1991.
Na Piarsaigh entered the championship as the defending champions, however, they were defeated by Blackrock in the second round.
The final was played on 22 September 1991 at Páirc UàChaoimh in Cork between Midleton and Glen Rovers, in what was their first meeting in a final in 53 years. Midleton won the match by 1âÂÂ17 to 1âÂÂ08 to claim their seventh championship title overall and their first title since 1987.
Ger O'Riordan was the championship's top scorer with 1-22.