1990–91 Irish Cup
| Country |
 Northern Ireland
|
||
|---|---|---|---|
| Teams | 32 | ||
| Champions | Portadown (1st win) | ||
| Runners-up | Glenavon | ||
| Matches played | 36 | ||
| Goals scored | 125 (3.47 per match) | ||
|
|||
The 1990–91 Irish Cup was the 111th edition of Northern Ireland's premier football knock-out cup competition. It concluded on 4 May 1991 with the final.
Glentoran were the defending champions after winning their 15th Irish Cup last season, defeating Portadown 3–0 in the 1990 final. This season Portadown went one better by winning their first Irish cup in their fifth appearance in the final. They defeated Glenavon 2–1 in the final.
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