Talyllyn or Tal-y-llyn can refer to:
Tal-y-llyn, Gwynedd, the hamlet and former parish in Gwynedd in Wales Tal-y-llyn Lake, a glacial ribbon lake east of Abergynolwyn Talyllyn Railway, a preserved narrow gauge railway running from Tywyn to Abergynolwn Talyllyn (locomotive), one of the original locomotives of the Talyllyn Railway Talyllyn and Llanfihangel Talyllyn, small settlements in the Powys community of Llangors Talyllyn Junction, a nearby junction on the Mid Wales Railway in Powys Tal-y-llyn, Anglesey, a former episcopal township on Anglesey St Mary's Church, Tal-y-llyn, the township's church