Castletown
Castletown may refer to:
- Castle town, a settlement built adjacent to or surrounding a castle
Places
Australia
- Castletown, Western Australia, a suburb of the remote town of Esperance
Republic of Ireland
- Castletownroche, County Cork
- Castletown, County Cork (disambiguation), several townlands and villages
- Castletown, County Laois
- Castletown, County Limerick, a townland and village in County Limerick
- Castletown House, County Kildare
- Castletownbere, County Cork
- Castletown-Geoghegan, County Westmeath
- Castletown, County Wexford
- Castletown Kilpatrick, County Meath
Isle of Man
United Kingdom
- Castletown, Cheshire
- Castletown, Dorset
- Castletown, Highland, Scotland
- Castletown, Penrith, Cumbria
- Castletown, County Antrim, a townland in Islandmagee, County Antrim, Northern Ireland
- Castletown, County Tyrone, a townland in Carnteel parish, County Tyrone, Northern Ireland
- Castletown, Sunderland
- RAF Castletown, Scotland
Other uses
- Castletown (horse), a New Zealand Thoroughbred racehorse
- Castletown, County Mayo, the fictional setting of the mockumentary Hardy Bucks