The 2002–03 All-Ireland Senior Club Football Championship was the 33rd staging of the All-Ireland Senior Club Football Championship since its establishment by the Gaelic Athletic Association in 1970-71. The championship began on 27 October 2002 and ended on 17 March 2003. Ballinderry entered the championship as the defending champions, however, they were beaten by Errigal Ciarán in the Ulster Club Championship. Nemo's Colin Corkery was the championship's top scorer with 2-23.