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.

This Conwy County Borough location article is a stub.