Castleknock
| Castleknock Caisleán Cnucha | |
|---|---|
| Suburb (village core) | |
| Coordinates: 53°22′26″N 6°21′32″W / 53.374°N 6.359°W | |
| Country | Ireland | 
| Province | Leinster | 
| County | County Dublin | 
| Council | Fingal County Council | 
| Dáil Éireann | Dublin West | 
| EU Parliament | Dublin | 
| Elevation | 63 m (207 ft) | 
| Population  (2022)
 | |
| • Urban | 27,049 | 
| Postal district(s) | D15 | 
| Dialing code | 01, +353 1 | 
| Irish Grid Reference | O078378 | 
Castleknock (Irish: Caisleán Cnucha) is an affluent village in County Dublin, Ireland, located 8 km (5 mi) west of the centre of Dublin city. It is in the modern county of Fingal.
In addition to the village, the name "Castleknock" also refers to older units of land division: a townland, a civil parish and a barony.