The FA Cup 1930–31 was the 56th staging of the world's oldest football cup competition, the Football Association Challenge Cup, commonly known as the FA Cup. West Bromwich Albion of the Football League Second Division won the competition, beating First Division team Birmingham 2–1 in the final at Wembley, London. In doing so Albion became the first and to date only club to both win the cup and gain promotion in the same year.