Castleisland
| Castleisland Oileán Ciarraí | |
|---|---|
| Town | |
| Main Street, Castleisland, County Kerry | |
| Coordinates: 52°13′51″N 9°27′53″W / 52.2307°N 9.4647°W | |
| Country | Ireland | 
| Province | Munster | 
| County | County Kerry | 
| Elevation | 32 m (105 ft) | 
| Population  (2022) | 2,536 | 
| Irish Grid Reference | Q998099 | 
Castleisland (Irish: Oileán Ciarraí) is a town and commercial centre in County Kerry in south west Ireland. The town is known for the width of its main street. As of the 2022 census, Castleisland had a population of 2,536.
Castleisland was described by one of its citizens, journalist Con Houlihan, as "not so much a town as a street between two fields".