1989–90 Irish Cup
| Country |
 Northern Ireland
|
||
|---|---|---|---|
| Teams | 32 | ||
| Champions | Glentoran (15th win) | ||
| Runners-up | Portadown | ||
| Matches played | 35 | ||
| Goals scored | 88 (2.51 per match) | ||
|
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The 1989–90 Irish Cup was the 110th edition of Northern Ireland's premier football knock-out cup competition. It began on 20 January 1990 and concluded on 5 May 1990 with the final.
Ballymena United were the defending champions after winning their 6th Irish Cup last season, defeating Larne 1–0 in the 1989 final. However, this season they went out in the first round to Dungannon Swifts. Glentoran went on to win the cup for the fifth time in six seasons, and 15th time overall. They defeated Portadown 3–0 in the final.
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