Castle Island
# Castle Island

Castle Island may refer to:

## Bermuda

* Castle Island, Bermuda, one of the islands of Castle Harbour, Bermuda
   * Castle Islands Fortifications, 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

* Castle Island, 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
