Llanfihangel-yng-Ngwynfa (Welsh pronunciationⓘ) is a former parish in Montgomeryshire, now forming a major part of the community of Llanfihangel in Powys, which covers an area of 5,366 hectares (20.72 sq mi).

[2] The parish originally consisted of the following townships: Cefncleisiog, Cydwnfa, Dolwar, Fachwen, Farchwell, Fynnonarthwr, Garthucha, Halfen, Llaethbwlch, Llwydiarth, Nanty-Candy, and Rhiewlas.

[4] The main village is scattered along a gently winding uphill road extending many miles past St Michael's Church to the south.

At the centre are The Goat Inn, a post office/shop, and the village hall, opened in 1981, which has frequent whole-community, family and retired community events.

This was soon seen as a classic study of the social structure and life in a predominantly Welsh-speaking rural community in upland Wales.