Randal Plunkett, 21st Baron of Dunsany, is an Irish film director, producer and editor, as well as a landowner and holder of one of the oldest surviving Irish peerage titles, and one of the longest-inhabited houses in Ireland, Dunsany Castle, and its remaining estate.

Dunsany Castle, Dunsany, County Meath, Ireland is a modernised Anglo-Norman castle, started c. 1180 / 1181 by Hugh de Lacy, who also commissioned the original Killeen Castle, nearby, and the famous Trim Castle. It is one of Ireland's oldest homes in continuous occupation, possibly the longest occupied by a single family, having been held by the Cusack family and their descendants by marriage, the Plunketts, from foundation to the present day. The castle is surrounded by its demesne, the inner part of the formerly extensive Dunsany estate. The demesne holds a historic church, a walled garden, a stone farm complex, and an ice house, among other features, and is home to a wide range of fauna.