The 1919–20 Irish Cup was the 40th edition of the Irish Cup, the premier knock-out cup competition in Irish football.
Shelbourne won the tournament for the 3rd time.
They had defeated Glenavon in the semi-final, but crowd trouble marred the replay of the second semi-final between Belfast Celtic and Glentoran, and both clubs were subsequently expelled from the competition.
Shelbourne were subsequently declared winners of the cup.
[1][2] [3] 1Following crowd trouble at the semi-final replay at Solitude, both Belfast Celtic and Glentoran were expelled from the competition and Shelbourne were declared winners of the cup.