The 2009 All-Ireland Junior Football Championship was the 79th staging of the competition since its establishment by the Gaelic Athletic Association in 1912.
Traditionally, the four provincial championship winners face each other at the All-Ireland semi-final stage.
As the Ulster GAA council did not hold a provincial championship, the fourth semi-final spot was therefore taken by London, as winners of the 2009 All-Britain Junior Football Championship.
The victory of Cork in the final against Roscommon on 22 August, was the county's 15th in the history of the All-Ireland Junior Football Championship.