Ardmore (Aird Mhór in Irish, meaning "Great Height") is a fishing village located in County Waterford, Republic of Ireland near Youghal on Ireland's southeast coast (). The population is approx. 330. It is believed to be the oldest Christian settlement in Ireland. Saint Declan lived in the region 350-450 AD and christianised this area before the coming of Saint Patrick.

On a hill above the village is a well preserved 30m 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.

Today Ardmore is a popular seaside resort with a Blue Flag beach.

See also: List of towns in the Republic of Ireland