St Garmon's Church, Llanfechain, is in the village of Llanfechain, Powys, Wales. It is an active Anglican parish church in the deanery of Llanfyllin, the archdeaconry of Montgomery, and the diocese of St Asaph, and is designated by Cadw as a Grade II listed building. The church is traditionally associated with a 9th century Celtic saint, St Garmon.