Felin-fach (also spelled Felinfach) is a community in Powys, Wales, northeast of Brecon.

The community had a population of 673 as of the 2011 UK Census.

[1] It includes the villages and hamlets Llandyfaelog Tre'r-graig, Llanfilo, Tredomen, Trefeitha, Pen-isa'r-waen and Talachddu.

[2] St Bilo's Church, Llanfilo is dedicated to Saint Bilo and is a Grade I listed building, as is the Church of St Matthew at Llandefalle.

This Powys location article is a stub.