Tal-y-llyn, or Talyllyn, is a small hamlet and former parish in the community of Llanfihangel-y-Pennant in Gwynedd, Wales, situated at the end of Tal-y-llyn Lake close to the village of Abergynolwyn.

The parish covered an area of 36,000 acres (15,000 ha).

The Talyllyn Railway was built in the 1860s to serve the quarries at Bryn Eglwys.

[2] Tourism is now one of the principle industries in the area, and the hamlet includes a hotel and public house.

[4] John David Edwards, a cleric and hymn tune composer, is buried in the churchyard.