St Cynfarwy's Church is a medieval parish church in Llechgynfarwy, Anglesey, north Wales. The first church in the vicinity was established by St Cynfarwy in about 630, but no structure from that time survives. The present building contains a 12th-century baptismal font, indicating the presence of a church at that time, although extensive rebuilding in 1867 removed the datable features of the previous edifice.