Llancynfelyn, sometimes Llangynfelyn, is a village and parish in the north of Ceredigion, (formerly Cardiganshire), Wales. The village stands some nine miles north of Aberystwyth on the B4353 close to the main A487 road, and the same distance south of Machynlleth.

The Parish was a rich mining area, with several lead and copper mines in the vicinity, the spoils of which were exported from the Dyfi Estuary. The Parish Church, dedicated to St Cynvelyn, was originally erected in the sixth century. The present church was restored, or rather rebuilt, during Victorian times. Within the Church is the Parish War Memorial to the men of Llancynfelyn who fell during both World Wars.

The railway from Aberystwyth to Machynlleth runs through the parish, but the nearest stations are at Borth and Glandyfi.

The parish contains a number of individual farms and dwellings, as well as several villages and hamlets, namely Tre-Taliesin, Tre'rddôl, Craig-y-Penrhyn and Goitre. Tre-Taliesin, sometimes Taliesen, is named after the nearby grave of the poet Taliesin.

Long distance walkers would be spoilt for choice with three long distance trails passing close by the parish: the All Wales Coastal Path meanders by en-route from Machynlleth to Aberystwyth; ditto the Ceredigion Coast Path from Aberystwyth to Aberdovey; and the Borth to Devil's Bridge and Pontrhydfendigaid Trail passes to the south of the village.