| Football Association of Wales Challenge Cup | |
| Year: | 1890–91 |
| Country: | Wales |
| Winners: | Shrewsbury Town |
| Second: | Wrexham |
| Prev Season: | 1889–90 |
| Next Season: | 1891–92 |
The 1890–91 FAW Welsh Cup was the 14th edition of the annual knockout tournament for competitive football teams in Wales. The competition was won by Shrewsbury Town.
| Home team | Result | Away team | Remarks |
|---|---|---|---|
| Mold | 3–2 | Holywell | |
| Carnarvon Athletic | 3–4 | Rhyl | |
| Bangor | 7–4 | Colwyn Bay | |
| Colwyn Bay | 1–3 | Bangor | Replay |
| St Asaph | 3–2 | Bangor Athletic | |
| Buckley | w/o | Northwich Victoria | Buckley withdrew |
| Brymbo Institute | 2–2 | Gresford | |
| Gresford | 2–1 | Brymbo Institute | Replay |
| Westminster Rovers | w/o | Nantwich | Nantwich withdrew |
| Crewe Alexandra | w/o | Wrexham | Crewe Alexandra withdrew |
| Chirk | 2–1 | Ruabon Druids | |
| Wrexham Hibernians | 2–2 | Overton | |
| Overton | 2–3 | Wrexham Hibernians | Replay |
| Corwen | 0–2 | Rhosllanerchrugog | |
| Oswestry | 4–3 | Rhayader | |
| Shrewsbury Town | Bye | ||
| Wellington St George | |||
| Builth | |||
| Home team | Result | Away team | Remarks | |
|---|---|---|---|---|
| St Asaph | w/o | Rhyl | St Asaph withdrew | |
| Bangor | 4–1 | Mold | Bangor disqualified | |
| Northwich Victoria | w/o | Wrexham | Northwich Victoria withdrew | |
| Gresford | 3–4 | Westminster Rovers | ||
| Rhosllanerchrugog | 2–1 | Chirk | ||
| Wrexham Hibernians | 3–5 | Rhostyllen Victoria | ||
| Oswestry | 1–0 | Wellington St George | ||
| Shrewsbury Town | 4–1 | Builth |
| Home team | Result | Away team | Remarks | |
|---|---|---|---|---|
| Rhyl | 2–2 | Mold | Mold won 3–2 after extra time | |
| Westminster Rovers | 0–1 | Wrexham | ||
| Rhostyllen Victoria | 1–2 | Chirk | ||
| Shrewsbury Town | 6–0 | Oswestry |
| Result | Venue | Crowd | |||
|---|---|---|---|---|---|
| Wrexham | 4–3 | Chirk | Shrewsbury | ||
| Shrewsbury Town | 5–0 | Mold | The Racecourse Ground, Wrexham |