| Tonfanau | |
|---|---|
 The Station Master's old house and Tonfanau quarry | |
  Tonfanau Location within Gwynedd | |
| OS grid reference | SH 56154 03798 |
| Community | |
| Principal area | |
| Preserved county | |
| Country | Wales |
| Sovereign state | United Kingdom |
| Post town | TYWYN |
| Postcode district | LL36 |
| Dialling code | 01654 |
| Police | North Wales |
| Fire | North Wales |
| Ambulance | Welsh |
| UK Parliament | |
| Senedd Cymru – Welsh Parliament | |
Tonfanau is a coastal village in the community of Llangelynnin, in Gwynedd (formerly Merionethshire), Wales. It is 2.4 miles (3.9 km) north of Tywyn. The village is served by Tonfanau railway station.
During the Second World War an army base was created near the village. Around 600 men were stationed at the camp, which specialised in training personnel in anti-aircraft artillery.
Until 1992, a granite quarry existed to the north of the village.