Llanfechain is a village and community in Powys, Wales, on the B4393 road between Llanfyllin and Llansantffraid-ym-Mechain.

[9] The parish church, St Garmon's, was begun in Norman times and retains many original features.

The remains of the mound, Twmpath Garmon, are still evident north of the church, although graves have been dug into it.

According to the recollections of 19th-century villagers recorded in Volume 5 of the Montgomeryshire Collections, cockpits were dug near to the mound for cockfighting.

[15][16] In order of birth date: Llanfechain was served by a station on the Llanfyllin branch of the Cambrian Railways from 1863.

A traditional village show had been held on the August Bank Holiday weekend every year since 1966,[36] but had to be cancelled in 2020 due to the COVID-19 pandemic.