The 2009 Cork Senior Football Championship was the 121st 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 14 December 2008. The championship began on 18 April 2009 and ended on 9 October 2009.
Nemo Rangers entered the championship as the defending champions, however, they were defeated by Carbery at the quarter-final stage.
On 27 September 2009, Clonakilty won the championship following a 1-13 to 1-12 defeat of St. Finbarr's in the final. This was their 9th championship title overall and their first title since 1996.
Duhallow's Donncha O'Connor was the championship's top scorer with 3-19.
Promoted from the Cork Premier Intermediate Football Championship
Relegated to the Cork Premier Intermediate Football Championship