Dette er en liste over øer i Wales, hvis hovedland er en del af Storbritannien. Den indeholder også en liste over de største walisiske øer efter areal. Listen inkludere tidevandsøer som Sully Island men ikke steder som Shell Island der på trods af navnet egentlig et en halvø.
Øer Navn Øgruppe/placering Anglesey (Ynys Môn) Irske Hav Bardsey Island (Ynys Enlli) Gwynedd Barry Island (Ynys y Barri) Vale of Glamorgan (forbundet til hovedlandet i 1880'erne) Burry Holms Gower Caldey Island (Ynys Bŷr) Pembrokeshire Cardigan Island (Ynys Aberteifi) Ceredigion Carreg Onnen Pembrokeshire Carreg Rhoson Pembrokeshire Carreg yr Halen Anglesey Cei Ballast Porthmadog (dannet af skibsballast) Church Island (Ynys Dysilio) Anglesey Cribinau (Ynys Cribinau) Anglesey Daufraich Pembrokeshire Denny Island (Ynys Denny) Monmouthshire East Mouse (Ynys Amlwch) Anglesey Emsger Pembrokeshire Flat Holm (Ynys Echni) Bristol Channel Gateholm Pembrokeshire (tidal island) Grassholm (Gwales/Ynys Gwales) Pembrokeshire Holy Island (Ynys Gybi) Anglesey Maen Gwenonwy Llyn Peninsula (tidal island) Middle Head Gower (tidevandsø) Middle Mouse (Ynys Badrig) Anglesey Middleholm (aka Midland Isle) Pembrokeshire Mumbles Head Island (Y Mwmbwls) Gower (tidal island) North Stack (Ynys Arw) Anglesey Puffin Island (Ynys Seiriol) Anglesey Ramsey Island (Ynys Dewi) Pembrokeshire St Catherine's Island (Ynys Catrin) Pembrokeshire St Margaret's Island (Ynys Farged) Pembrokeshire St Tudwal's Island East (Ynys Tudwal Fach) St Tudwal's Islands St Tudwal's Island West (Ynys Tudwal Fawr) St Tudwal's Islands Salt Island (Ynys yr Halen) Anglesey Sheep Island (Ynys y defaid) Pembrokeshire (tidal island) The Skerries (Ynysoedd y Moelrhoniaid) Anglesey Skokholm (Ynys Sgoc-holm) Pembrokeshire Skomer (Ynys Skomer) Pembrokeshire South Stack (Ynys Lawd) Anglesey Sully Island Vale of Glamorgan (tidal island) Thorn Island PembrokeshireMystery buyer for island, 27 July 1999, BBC, accessed 31 August 2008 Tusker Rock (Ynys Twsgr) Vale of Glamorgan West Mouse (Maen y Bugail) Anglesey Worms Head (Pen Pyrod) Gower (tidevandsø) 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 (tidevandsø) Ynys Gored Goch Anglesey Ynys Gwelltog Pembrokeshire Ynys Llanddwyn Anglesey (tidevandsø) Ynys Lochtyn Ceredigion Ynys Meicel Pembrokeshire Ynys Moelfre Anglesey Ynys Onnen Pembrokeshire Ynys Welltog Anglesey Ynys y Bîg Anglesey
Største øer Ø Areal (sq mi) Areal (km2) 1 Anglesey 260.37 674.36 2 Holy Island 15.22 39.44 3 Skomer 1.12 2.90 4 Ramsey Island 0.99 2.58 5 Caldey Island 0.84 2.18 6 Bardsey Island 0.79 2.06 7 Skokholm 0.41 1.06 8 Flat Holm 0.21 0.339Ynys Llanddwyn0.190.310 Puffin Island 0.11 0.28 11 Cardigan Island 0.06 0.15
Holy Island og Anglesey bliver ofte talt sammen, men der er reelt adskilt af en smal kanal.
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