| Llyn Alwen | |
| Location: | Mynydd Hiraethog, Conwy County Borough, Wales |
| Coordinates: | 53.0947°N -3.6474°W |
| Type: | lake |
| Pushpin Map: | Wales |
| Pushpin Map Alt: | Location of the lake in Wales. |
Llyn Alwen is a small natural upland lake on Mynydd Hiraethog in Conwy County Borough, Wales at SH 898 565.It lies on the rolling Silurian moorland to the north-west of Mwdwl-eithin and about 10 km to the east of Betws y Coed. The discharge from the lake flows under the A543 road to form the headwater of Alwen Reservoir. The area was used as a special stage during the 2015 Wales Rally GB.