Ardmore (Aird Mhór in Irish, meaning "Great Height") is a small fishing village in County Waterford. It is believed to be the oldest Christian settlement in Ireland. Saint Declan lived in the region at some time in the period 350 – 450 AD and christianized the area before the coming of Saint Patrick.

On a hill above the village is a well preserved 30-m high, 12th-century round tower and the ruins of St Declan's church and oratory dating from the 13th and 8th centuries respectively. One of the outer walls of the church features some stone carvings retrieved from an earlier 9th-century building. The carvings include a very early image of a harp, and of Adam and Eve in the garden.