The 1983–84 Irish Cup was the 104th edition of the Irish Cup, Northern Ireland's premier football knock-out cup competition. It began on 28 January 1984, and concluded on 5 May 1984 with the final.
Glentoran were the defending champions after winning their 10th Irish Cup last season, defeating rivals Linfield 2–1 in the 1983 final replay.[1] This season they reached the semi-finals, but lost to Carrick Rangers. Ballymena United won their fourth Irish Cup, defeating Carrick Rangers 4–1 in the final.[2]