The 1998–99 All-Ireland Senior Club Football Championship was the 29th staging of the All-Ireland Senior Club Football Championship since its establishment by the Gaelic Athletic Association in 1970-71. The championship began on 4 October 1998 and ended on 17 March 1999. Corofin entered the championship as the defending champions, however, they were beaten by Ballina Stephenites in the Ulster Club Championship. Crossmaglen's Oisín McConville was the championship's top scorer with 1-31.