Castleknock is an affluent suburb located 8 km (5 mi) west of the centre of Dublin city, Ireland. It is centred on the village of the same name in Fingal.

Fingal is a county in Ireland. It is in the province of Leinster and is part of the Eastern and Midland Region. It is one of three successor counties to County Dublin, which was disestablished for administrative purposes in 1994. Its name is derived from the medieval territory of Scandinavian foreigners that settled in the area. Fingal County Council is the local authority for the county. In 2022 the population of the county was 330,506, making it the second most populated council in Dublin and the third most populous county in the state.