| 1930–31 Welsh Cup | |
| Country: | Wales |
| Winners: | Wrexham |
| Second: | Shrewsbury Town |
| Prev Season: | 1929–30 |
| Next Season: | 1931–32 |
The 1930–31 FAW Welsh Cup is the 50th season of the annual knockout tournament for competitive football teams in Wales.
League name pointed after clubs name.
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Chester (CCL) | 9–1 | Cross Street Gwersyllt |
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Llanfairfechan | 2–11 | Chester (CCL) |
Eight winners from the Fourth round and eight new clubs.
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Newport County (FL D3N) | 1–1 | Chester (CCL) | ||||
| replay | Chester (CCL) | 0–0 | Newport County (FL D3N) | ||||
| replay | Newport County (FL D3N) | 2–4 | Chester (CCL) |
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Chester (CCL) | 0–1 | Cardiff City (FL D2) |
Match between Swansea Town and Wrexham were held at Chester.
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Shrewsbury Town (B&DL) | 1–0 | Cardiff City (FL D2) | ||||
| 2 | Swansea Town (FL D2) | 2–5 | Wrexham (FL D3N) |
| width=50 | Tie no | width=250 | Home | width=50 | Score | width=250 | Away |
|---|---|---|---|---|---|---|---|
| 1 | Wrexham (FL D3N) | 7–0 | Shrewsbury Town (B&DL) |