List of islands of Wales
This is a list of islands of Wales, the mainland of which is part of Great Britain, as well as a table of the largest Welsh islands by area. The list includes tidal islands such as Sully Island but not locations such as Shell Island which, though they are termed islands, are peninsulas.
| Name | Island group/location |
| Anglesey | Irish Sea |
| Bardsey Island | Gwynedd |
| Barry Island | Vale of Glamorgan |
| Caldey Island | Pembrokeshire |
| Cardigan Island | Ceredigion |
| Caldey Island | Pembrokeshire |
| Carreg Onnen | Pembrokeshire |
| Church Island | Anglesey |
| Cribinau | Anglesey |
| East Mouse | Anglesey |
| Flat Holm | Bristol Channel |
| Gateholm | Pembrokeshire |
| Grassholm | Pembrokeshire |
| Holy Island | Anglesey |
| Middle Head | Gower |
| Middle Mouse | Anglesey |
| Middleholm | Pembrokeshire |
| Mumbles Head Island | Gower |
| North Stack | Anglesey |
| Puffin Island | Anglesey |
| Ramsey Island | Pembrokeshire |
| St Catherine's Island | Pembrokeshire |
| St Margaret's Island | Pembrokeshire |
| St Tudwal's Island East | St Tudwal's Islands |
| St Tudwal's Island West | St Tudwal's Islands |
| Salt Island | Anglesey |
| Sheep Island | Pembrokeshire |
| The Skerries | Anglesey |
| Skokholm | Pembrokeshire |
| Skomer | Pembrokeshire |
| South Stack | Anglesey |
| Sully Island | Vale of Glamorgan |
| Thorn Island | Pembrokeshire |
| Tusker Rock | Vale of Glamorgan |
| West Mouse | Anglesey |
| Worms Head | Gower |
| Ynys Benlas | Anglesey |
| Ynys Beri | Pembrokeshire |
| Ynys Cantwr | Pembrokeshire |
| Ynys Castell | Anglesey |
| Ynys Dulas | Anglesey |
| Ynys Eilun & Pont yr Eilun | Pembrokeshire |
| Ynys Faelog | Anglesey |
| Ynys Feurig | Anglesey |
| Ynys Gaint | Anglesey |
| Ynys Gifftan | Gwynedd |
| Ynys Gored Goch | Anglesey |
| Ynys Gwelltog | Pembrokeshire |
| Ynys Llanddwyn | Anglesey |
| Ynys Lochtyn | Ceredigion |
| Ynys Moelfre | Anglesey |
| Ynys y Bîg | Anglesey |