The 1989-90 Welsh Cup winners were Hereford United. The final was played at the National Stadium in Cardiff in front of an attendance of 4,182.
| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Barry Town | 0–1 | Wrexham | |
| 2 | Cardiff City | 0–3 | Hereford United |
| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Wrexham | 0-0 | Barry Town | |
| 2 | Hereford United | 1-3 | Cardiff City |