The 2003–04 Irish Cup was the 124th edition of the Irish Cup, Northern Ireland's premier football knock-out cup competition. It concluded on 1 May 2004 with the final.
Coleraine were the defending champions, winning their 5th Irish Cup last season after a 1–0 win over Glentoran in the 2003 final. This season the same two clubs reached the final again. A 1–0 victory for Glentoran, who were appearing in the final for the sixth time in nine years was enough to seal their 20th Irish Cup win.
Results The following teams were given byes into the second round: Strabane, Kilbride Swifts, Newington, Ballymacash Rangers, Richhill, Queen's University, and Killymoon Rangers.
First round
Second round
Third round
Third round (A)
Fourth round
Fifth round
Replays
Sixth round
Replays
Quarter-finals
Replay
Semi-finals
Final
References