1979–80 Welsh Cup
The 1979–80 Welsh Cup was the 93rd season of the main domestic football cup competition in Wales, the Welsh Cup.
Qualifying round
| Tie no | Home team | Score | Away team | Notes |
| 1 | Llandudno Town | 1–3 | Rhos United | |
| 2 | Conwy United | 11–1 | British Steel | |
| 3 | Llandudno Amateurs | 1–2 | Abergele United | |
| 4 | Llanfair Caereinion | 5–1 | Ffostrasol Wanderers | |
| 5 | Barmouth & Dyffryn United | 0–2 | Aber AC | |
| 6 | Rhayader Town | 4–3 | Montgomery Town | |
| 7 | Abergavenny Thursdays | 1–2 | Spencer Works Newport | |
| 8 | Talgarth | 1–8 | Taff's Well | |
| 9 | Trelewis | 1–3 | Brecon Corinthians |
First round
Second round
Third round
| Tie no | Home team | Score | Away team | Notes |
| 1 | Oswestry Town | 6–0 | Berriew | |
| 2 | Bangor City | 3–0 | Presteigne St Andrews | |
| 3 | Nantlle Vale | 3–0 | Newtown | |
| 4 | Druids United | 1–2 | Connah's Quay Nomads | |
| 5 | Brymbo Steelworks | 4–0 | Colwyn Bay | |
| 6 | Merthyr Tydfil | 4–0 | Caerau | |
| 7 | Kidderminster Harriers | 2–1 | Maesteg Park Athletic | |
| 8 | Worcester City | 7–0 | BP Llandarcy | |
| 9 | Pontllanfraith | 3–1 | Ton Pentre | |
| 10 | Barry Town | 4–1 | Bridgend Town |
Semi-finals
| Tie no | Home team | Score | Away team | Notes |
| 1 | Newport County | 3–1 | Merthyr Tydfil | |
| 2 | Swansea City | 2–2 | Shrewsbury Town | |
| Replay | Shrewsbury Town | 2–2 | Swansea City | Shrewsbury Town win 6–5 on penalties |