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Castlereagh // may refer to:
- Marquess of Londonderry, subsidiary title Viscount Castlereagh, used as courtesy title for the Marquess's eldest son; in particular
- Robert Stewart, Viscount Castlereagh (1769–1822) later 2nd Marquess of Londonderry: Irish statesman and British Foreign Secretary.
In Northern Ireland:
- Castlereagh (borough), a local government district near Belfast
- Castlereagh (County Down townland) which gives its name to the borough
- Castlereagh (County Down barony), latterly divided into
- In the Republic of Ireland
- County Mayo: townlands in two baronies:
- Castlereagh, County Offaly, townland in Lemanaghan parish, Garrycastle barony
- County Roscommon:
- Castlereagh, County Waterford, townland in Kilronan parish, Glenahiry barony
- In Australia
- Castlereagh, New South Wales, a suburb of Sydney
- Castlereagh River, two rivers
- Castlereagh Highway, a New South Wales state highway
- Other places
- Castlereagh, Nova Scotia, a former village on the Bass River in Nova Scotia, Canada
- Castlereagh Dam and Reservoir, in Nuwara Eliya district, Sri Lanka
disambiguation page lists articles associated with the title Castlereagh.
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