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Ashtown Castle is a tower house in the Phoenix Park.
It was found hidden within the walls of a much larger and more recent Georgian building, the Under Secretary's Lodge also known as Ashtown Lodge, that was being used by the Papal Nuncio until 1978. At that time, the Lodge was deemed structurally irreparable due to dry rot. However, as the building was being demolished, Ashtown Castle was discovered. It has now been restored and forms part of the Phoenix Park Visitor Centre.
It is thought to originally date from the 1430s.

Phoenix Park is an urban park in Dublin, lying 2–4 km west of the city centre, north of the River Liffey. Its 11 km perimeter wall encloses 707 hectares; it is one of the largest enclosed recreational spaces within any European capital city. It includes large areas of grassland and tree-lined avenues, and since the 17th century has been home to a herd of wild fallow deer. The English name comes from the Irish fionn uisce meaning "clear water".