The following is a list of notable mountain passes in Wales:
| width=25% | Pass name | width=25% | Translation/alt. name | width=25% | Road number | width=10% | OS grid ref of summit | width=25% | Historic county | width=25% | Principal area | width=25% | National Park? | width=25% | Maximum Elevation(m) | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Aberglaslyn Pass | A498 | Caernarfonshire | Gwynedd | Snowdonia | ||||||||||||
| Bwlch Bryn-rhudd | English: pass of the crimson hill | A4067 between Defynnog and Abercraf | Brecknockshire | Powys | Brecon Beacons | |||||||||||
| Bwlch Cerrig Duon | English: pass of the black stones | minor road between Trecastle and Swansea Valley | Brecknockshire | Powys | Brecon Beacons | 369m | ||||||||||
| Bwlch y Cloddiau | a.k.a. 'the Mohican Road' | right of way between Llangurig and Cwmystwyth | Montgomeryshire | Powys | 533m | Right of way. Eastern approach paved road; western approach largely unpaved. | ||||||||||
| Bwlch y Fedwen | A458 between Mallwyd and Llangadfan | Montgomeryshire | Powys | |||||||||||||
| Bwlch Esgair Gelli | road between Abergwesyn and Tregaron | Cardiganshire | Ceredigion | 472m | ||||||||||||
| Bwlch ar y Fan | a.k.a. the Gap Road | restricted byway between Pontsticill and Brecon | Brecknockshire | Powys | Brecon Beacons | 599m | Rocky track over the pass. | |||||||||
| Bwlchgylfin | B4418 between Rhyd Ddu and Dyffryn Nantlle | Caernarfonshire | Gwynedd | Snowdonia | 236m | |||||||||||
| Bwlch Llyn Bach | English: pass of the small lake | A487 between Dolgellau and Corris | Merionethshire | Gwynedd | Snowdonia | 285m | ||||||||||
| Bwlch Oerddrws | A470 between Dolgellau and Dinas Mawddwy | Merionethshire | Gwynedd | Snowdonia | 363m | |||||||||||
| Bwlch y Parc | A494 between Mold and Vale of Clwyd | Denbighshire | 291m | through the Clwydian Range | ||||||||||||
| Bwlch Penbarras | a.k.a. 'Old Bwlch' | minor road between Tafarn-y-Gelyn and Llanbedr-Dyffryn-Clwyd | Denbighshire | 362m | through the Clwydian Range | |||||||||||
| Bwlch Pen-y-feidiog | a.k.a. 'The Gated Road' | minor road between Llanuwchllyn and Bronaber | Merionethshire | Gwynedd | Snowdonia | 531m | ||||||||||
| English translation: pass of the two stones | minor road/track between Abergwyngregyn and Vale of Conwy | Caernarfonshire | Gwynedd | Snowdonia | 429m | |||||||||||
| Welsh: Bwlch y Gorddinan | A470 | Caernarfonshire & Merionethshire | Gwynedd | Snowdonia | 385m | |||||||||||
| Bwlch y Groes | English translation: pass of the crossCommonly known as Hellfire Pass | minor road between Llanuwchllyn and Dinas Mawddwy | Merionethshire | Gwynedd | Snowdonia | 545m | Highest paved pass in North Wales. | |||||||||
| Welsh: Bwlch yr Efengyl | minor road from Hay-on-Wye to Vale of Ewyas | Powys | Brecon Beacons | 549m | Highest paved pass in Wales. | |||||||||||
| Welsh: Bwlch yr Oernant (pass of the cold stream) | A542 | Denbighshire | Denbighshire | 417m | ||||||||||||
| Milltir Gerrig | English translation: mile of stones | B4391 between Llangynog and Bala | Merionethshire | Snowdonia | 486m | |||||||||||
| Nant Ffrancon Pass | A5 between Bethesda, Gwynedd, and Llyn Ogwen in Conwy | Caernarfonshire | Gwynedd | Snowdonia | 312m | |||||||||||
| Pengenffordd | A470 between Talgarth and Vale of Usk | Brecknockshire | Powys | Brecon Beacons | ||||||||||||
| Pen-y-Pass | English: Llanberis Pass | A4086 | Gwynedd | Snowdonia | 359m | [1] | ||||||||||
| Pen Rhiw-wen | A4069 between Llangadog and Brynaman | Carmarthenshire | Carmarthenshire | Brecon Beacons | ||||||||||||
| Rhiw Fawr | English: Forge Road | minor road between Machynlleth and Staylittle | Montgomeryshire | Powys | 509m | |||||||||||
| Pen Bwlch Llandrillo | Drovers road between Llanarmon Dyffryn-Ceiriog and Llandrillo/Cynwyd | Merionethshire | Denbighshire | 580m | Unpaved drovers road over the pass. | |||||||||||
| Storey Arms | A470 between Brecon and Merthyr Tydfil | Brecknockshire | Powys | Brecon Beacons | 435m | |||||||||||
| Welsh: Bwlch Sychnant (dry stream pass) | minor road between Dwygyfylchi and Conwy | Caernarfonshire | Conwy | 158m | ||||||||||||
| minor road from Talybont-on-Usk to Pontsticill | Brecknockshire | Powys | Brecon Beacons | |||||||||||||
| A4067 | Powys | Brecon Beacons | ||||||||||||||
Where not otherwise specified, much information is taken from 1:25,000 and 1:50,000 scale maps published by the Ordnance Survey.