The 1990–91 Welsh Cup winners were Swansea City. The final was played at the National Stadium in Cardiff in front of an attendance of 5,000.
Fourth round
edit| Tie no | Home team | Score | Away team |
|---|---|---|---|
| 1 | Aberystwyth Town | 1–3 | Hereford United |
| 2 | Ammanford Town F.C. | 0–5 | Wrexham |
| 3 | B.P Llandarcy | 0–5 | Stroud |
| 4 | Bangor City | 4–1 | Lex XI |
| 5 | Caernarfon Town | 1–2 | Abergavenny Thursdays |
| 6 | Barry Town | 3–1 | Cheltenham Town |
| 7 | Merthyr Tydfil | 0–1 | Swansea City |
| 8 | Newport | 0–1 | Colwyn Bay |
Quarter-finals
edit| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Barry Town | 1–1 | Bangor City | |
| Replay | Bangor City | 0–1 | Barry Town | |
| 2 | Colwyn Bay | 1–1 | Swansea City | |
| Replay | Swansea City | 1–0 | Colwyn Bay | |
| 3 | Bangor City | 0–0 | Hereford United | |
| Replay | Hereford United | 0–0 | Bangor City | |
| Hereford win 4–3 on penalties | ||||
| 4 | Stroud | 1–2 | Wrexham | |
Semi-finals – 1st leg
edit| Tie no | Home team | Score | Away team |
|---|---|---|---|
| 1 | Barry Town | 2–2 | Swansea City |
| 2 | Wrexham | 1–1 | Hereford United |
Semi-finals – 2nd leg
edit| Tie no | Home team | Score | Away team |
|---|---|---|---|
| 1 | Swansea City | 1–0 | Barry Town |
| 2 | Hereford United | 1–2 | Wrexham |
Final
edit
       Swansea City
|
  Wrexham
|
