Øer i Wales

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	Pembrokeshire
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	0.33
9	Ynys Llanddwyn	0.19	0.3
10	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.