The 1919–20 FA Cup was the 45th season of the world's oldest football knockout competition; the Football Association Challenge Cup, or FA Cup for short.
The large number of clubs entering the tournament from lower down the English football league system meant that the competition started with an extra Preliminary and preliminary rounds prior to six qualifying rounds.
Ties were on a wider regional basis than the previous round.
The 12 winners from the previous round were joined by 12 clubs from the Football League and the Southern League.
The second replay between Gillingham and Swansea Town took place on 31 December 1919 and the third replay on 5 January 1920.