Castle Island may refer to:
Bermuda
- Castle Island, Bermuda, one of the islands of Castle Harbour, Bermuda
Canada
- Castle Island, Alberta
- Castle Island, Manitounuk Islands, Nunavut
Greenland
- Castle Island (Greenland), an island in Sherard Osborn Fjord
Ireland
- Castle Island (County Cork), and uninhabited island in Roaringwater Bay (51.507518N, 9.504267W)
- Castle Island (County Roscommon), an island in Lough Key
- Castleisland, a town in County Kerry, Ireland
New Zealand
United Kingdom
- Castle Island, County Down, a townland in County Down, Northern Ireland
- Castle Island, County Antrim, a townland in County Antrim, Northern Ireland
- Castle Island, Scotland
United States
- Castle Island (Massachusetts), an island in Boston Harbor
- Castle Island (New York), formerly an island in the Hudson River currently part of the Port of Albany-Rensselaer in Albany, New York
- Castle Island (Washington), one of the San Juan Islands
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