| Ynys Llanddwyn | |
|---|---|
 Tŵr Bach lighthouse with Snowdonia in background | |
  Ynys Llanddwyn Location within Anglesey | |
| Area | 0.3 km2 (0.12 sq mi) |
| Population | 0 |
| • Density | 0/km2 (0/sq mi) |
| OS grid reference | SH 3884 6288 |
| Community |
|
| Principal area | |
| Preserved county | |
| Country | Wales |
| Sovereign state | United Kingdom |
| Post town | Llangefni |
| Postcode district | LL61 |
| Dialling code | 01248 |
| Police | North Wales |
| Fire | North Wales |
| Ambulance | Welsh |
| UK Parliament | |
| Senedd Cymru – Welsh Parliament | |
Ynys Llanddwyn (also known as Llanddwyn Island) is a small tidal island off the west coast of Anglesey (Welsh: Ynys Môn), northwest Wales. The nearest settlement is the village of Newborough.