1979–80 Welsh Cup
The 1979–80 Welsh Cup was the final of 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
| Tie no | Home team | Score | Away team | Notes |
| 1 | Pwllheli & District | 2–0 | Porthmadog | |
| 2 | Connah's Quay Nomads | 6–2 | Abergele United | |
| 3 | Rhos United | 0–6 | Colwyn Bay | at Colwyn Bay |
| 4 | Conwy United | 1–0 | Caernarfon Town | |
| 5 | Courtaulds Greenfield | 0–3 | Flint Town United | |
| 6 | Blaenau Ffestiniog | 0–1 | Nantlle Vale | |
| 7 | Llay Welfare | 1–2 | Gresford Athletic | |
| 8 | Ruthin | 2–2 | Chirk AAA | |
| Replay | Chirk AAA | 0–2 | Ruthin | |
| 9 | Mold Alexandra | 0–5 | Brymbo Steelworks | |
| 10 | Denbigh Town | 1–3 | Druids United | |
| 11 | Bridgnorth Town | 0–1 | Kidderminster Harriers | |
| 12 | Stourbridge | 2–1 | Brierley Hill Alliance | |
| 13 | Newtown | 8–0 | Rhayader Town | |
| 14 | Caersws | 1–1 | Towyn | Towyn dismissed – ineligible player |
| 15 | Presteigne St Andrews | 6–2 | Knighton Town | |
| 16 | Machynlleth | 2–0 | Welshpool | |
| 17 | Llanfair Caereinion | 2–1 | Aberystwyth Town | at Aberystwyth |
| 18 | Berriew | 4–2 | Aber AC | |
| 19 | Llanidloes Town | 3–2 | Llandrindod Wells | |
| 20 | Brecon Corinthians | 2–3 | Afan Lido | |
| 21 | Taff's Well | 1–5 | Bridgend Town | at Bridgend |
| 22 | Sully | 0–3 | Barry Town | |
| 23 | Cardiff Corinthians | 0–0 | Ferndale Athletic | |
| Replay | Ferndale Athletic | 3–1 | Cardiff Corinthians | |
| 24 | Caerau | 2–1 | Abercynon Athletic | |
| 25 | Aberaman Athletic | 2–0 | Caerleon | |
| 26 | Ebbw Vale | 0–2 | Pontllanfraith | |
| 27 | Newport YMCA | 2–4 | Maesteg Park Athletic | |
| 28 | Spencer Works Newport | 7–0 | South Glamorgan Institute | |
| 29 | Merthyr Tydfil | 2–1 | Briton Ferry Athletic | |
| 30 | Pontardawe | 1–4 | Pembroke Borough | |
| 31 | Haverfordwest County | 4–1 | Morriston Town | |
| 32 | Milford United | 4–0 | Llanelli | |
| 33 | BP Llandarcy | 1–0 | Ammanford Town |
Second round
| Tie no | Home team | Score | Away team | Notes |
| 1 | Rhyl | 2–3 | Colwyn Bay | |
| 2 | Connah's Quay Nomads | 5–0 | Gresford Athletic | |
| 3 | Flint Town United | 0–3 | Brymbo Steelworks | |
| 4 | Ruthin | 1–1 | Druids United | |
| Replay | Druids United | 1–3 | Ruthin | |
| 5 | Conwy United | 2–6 | Oswestry Town | |
| 6 | Pwllheli & District | 0–3 | Nantlle Vale | |
| 7 | Machynlleth | 0–1 | Berriew | |
| 8 | Newtown | 4–0 | Llanfair Caereinion | |
| 9 | Caersws | 1–2 | Kidderminster Harriers | |
| 10 | Presteigne St Andrews | 2–1 | Llanidloes Town | |
| 11 | Maesteg Park Athletic | 3–2 | Haverfordwest County | |
| 12 | Bridgend Town | 3–0 | Spencer Works Newport | |
| 13 | Merthyr Tydfil | 3–1 | Aberaman Athletic | |
| 14 | Stourbridge | 2–3 | BP Llandarcy | |
| 15 | Ferndale Athletic | 0–1 | Caerau | |
| 16 | Ton Pentre | 2–1 | Pembroke Borough | |
| 17 | Milford United | 1–1 | Barry Town | |
| Replay | Barry Town | 4–0 | Milford United | |
| 18 | Afan Lido | 2–4 | Pontllanfraith |
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 |
Fourth round
Fifth round
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 |