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, a village Castletown, County Cork (disambiguation), several townlands and villages Castletown, County Laois, a village Castletown, County Limerick, a townland and village Castletown House, County Kildare, a country house Castletownbere, County Cork Castletown-Geoghegan, County Westmeath Castletown, County Wexford Castletown Kilpatrick, County Meath
Isle of Man Castletown, 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
See also Castleton (disambiguation)