The 2003 All-Ireland Senior Football Championship was the 117th staging of the All-Ireland Senior Football Championship, the Gaelic Athletic Association's premier inter-county Gaelic football tournament. The championship began on 4 May 2003 and ended on 28 September 2003. Armagh entered the championship as the defending champions. On 28 September 2003, Tyrone won the championship following a 0-12 to 0-9 defeat of Armagh in the All-Ireland final. This was their first All-Ireland title.