The 1887–88 Irish Cup was the 8th edition of the Irish Cup, the premier knock-out cup competition in Irish football.
Cliftonville won the tournament for the 2nd time, defeating Distillery 2–1 in the final.
The holders Ulster were eliminated in the quarter-finals by Distillery.
[1][2] 1 Whiteabbey protested about an opposition player's shirt colour and a replay was ordered.
2 Mountcollyer protested the referee's IFA status and a replay was ordered.