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This is alist ofislands ofWales, the mainland of which is part ofGreat Britain, as well as a table of the largest Welsh islands by area. The list includestidal islands such asSully Island but not locations such asShell Island which, though they are termed islands, are peninsulas.

• Holy Island and Anglesey are often counted together as they are separated by such a narrow channel.

There are no islands of any great size in lakes in Wales. Thecrannog inLlangorse Lake is an artificial island. Several reservoirs contain islets e.g.Llyn Brenig,Elan Valley Reservoirs andLlyn Trawsfynydd, the last named having the largest and most numerous, though some are linked by causeways.

Some places around the Welsh coast are called island or (Welsh) ynys, but are not. Caution is required in that whilst 'ynys' most commonly translates as island, it has other meanings too. Some of these named places were formerly islands surrounded bymarshland. Others arepeninsulas or just coastal settlements. They include:^[2]

• Barry Island (tidal island until the construction ofBarry Docks in the 1880s)
• Berges Island, peninsula atWhitford Burrows, Gower
• Dinas Island, peninsula onPembrokeshire coast
• Farchynys, locality besideMawddach estuary,Bontddu,Gwynedd
• Little Island, peninsula at the west end of the former Barry Island
• Shell Island
• Traeth Mawr - there are multiple examples of names including 'ynys' aroundTraeth Mawr, the now drained estuarine flats of theAfon Glaslyn, Gwynedd, including Hir Ynys, Ynys y Gwely, Ynys Ceiliog, Ynys Fawr, Ynys-fach and Ynys Fer-las.
• Ynys, hamlet on an area of raised ground known as Ynys Llanfihangel-y-traethau atMorfa Harlech, Gwynedd
• Ynys and nearby Ynys-fach on coast south ofDinas Dinlle, Gwynedd
• Ynysboeth, area ofAbercynon in theCynon Valley,Mid Glamorgan
• Ynysddu, village in theSirhowy valley,Caerphilly County Borough
• Ynyshir, village in theRhondda,Mid Glamorgan
• Ynyslas, locality atBorth, northCeredigion - there are multiple examples of names including 'ynys' around theDovey estuary including Ynys Tachwedd, Ynysfergi, Ynys Greigiog, Ynys-hir, Ynys Edwin, Ynys-Eidiol and simple 'Ynys'.
• Ynys Leurad, a small peninsula nearFour Mile Bridge,Anglesey
• Ynysmaerdy, village nearLlantrisant,Rhondda Cynon Taf
• Ynyswen, village in theRhondda,Mid Glamorgan
• Ynysybwl, village between theRhondda andCynon Valleys,Mid Glamorgan

• List of the British Isles

• Islands of Wales
• Lists of landforms of Wales
• Lists of islands by country
• Lists of islands of the United Kingdom
• Wales geography-related lists

• Articles with short description
• Short description is different from Wikidata
• Articles needing additional references from May 2013
• All articles needing additional references
• Articles containing Welsh-language text