Castlereagh ( ) may refer to:

People

Marquess of Londonderry Marquess of Londonderry, of the County of Londonderry ( ), is a title in the Peerage of Ireland. History The title was created in 1816 for Robert Stewart, 1st Earl of Londonderry. He had earlier represented County Down in the Irish House of ...

, subsidiary title Viscount Castlereagh, used as courtesy title for the Marquess's eldest son; in particular **

Robert Stewart, Viscount Castlereagh Robert Stewart, 2nd Marquess of Londonderry, (18 June 1769 – 12 August 1822), usually known as Lord Castlereagh, derived from the courtesy title Viscount Castlereagh ( ) by which he was styled from 1796 to 1821, was an Kingdom of Ireland, Ir ...

(1769–1822), later 2nd Marquess of Londonderry: Anglo-Irish statesman and British Foreign Secretary.

Places

In Northern Ireland: *

Castlereagh (borough) Castlereagh ( ) was a local government district with the status of borough in Northern Ireland. It merged with Lisburn City Council in May 2015 under local government reorganisation in Northern Ireland to become Lisburn and Castlereagh City ...

, a former local government district near Belfast *

Castlereagh (County Down townland) Castlereagh () is a townland and former hamlet in the civil parish of Knockbreda, barony of Castlereagh Lower, in County Down, Northern Ireland. It is southeast of Belfast and now at the fringe of the city's suburbs. The townland has an area of ...

which gives its name to the borough *

Castlereagh (County Down barony) Castlereagh () is the name of a former barony in County Down, present-day Northern Ireland. It spanned the north-eastern area of the county bordering the baronies of: Ards to the east; Belfast to the north; Iveagh to the west south; and Dufferin ...

, latterly divided into **

Castlereagh Upper Castlereagh Upper (named after the former barony of Castlereagh) is a historic barony in County Down, Northern Ireland. It was created by 1841 with the division of Castlereagh into two. It is bordered by eight other baronies: Castlereagh Lower an ...

and **

Castlereagh Lower Castlereagh Lower (named after the former barony of Castlereagh) is a historic barony in County Down, Northern Ireland. It was created by 1841 with the division of Castlereagh into two. The barony roughly matches the former Gaelic territory of '' ...

In the Republic of Ireland: * County Mayo: townlands in two baronies: ** Castlereagh, Clanmorris, Crossboyne parish ** Castlereagh, Tirawley, Killala parish * Castlereagh, County Offaly, townland in Lemanaghan parish, Garrycastle barony * County Roscommon: **

Castlerea Castlerea ( ; ) is a town in County Roscommon, Ireland. It is located in the west of the county and had a population of 2,348 at the 2022 census. Roughly translated from Irish, Castlerea is generally thought to mean 'brindled castle' (''Caisl ...

, town ** Castlereagh (County Roscommon barony), around the town ** Castlereagh (County Roscommon townland), townland around the town * Castlereagh, County Waterford, townland in Kilronan parish, Glenahiry barony In Australia: *

Castlereagh, New South Wales Castlereagh is a suburb of Sydney, in the state of New South Wales, Australia. Castlereagh is north-west of the Sydney central business district, in the local government area of the City of Penrith and is part of the Greater Western Sydney regi ...

, a suburb of Sydney *

Castlereagh River The Castlereagh River is located in the central–western district of New South Wales, Australia. It is part of the Macquarie-Castlereagh catchment within the Murray–Darling basin and is an unregulated river, meaning no dams or storage have b ...

, two rivers *

Castlereagh Highway Castlereagh Highway is a state highway located in New South Wales and Queensland, Australia. From north to south the highway traverses South West Queensland and the North West Slopes, Orana (New South Wales), Orana, and Central West (New South ...

, a New South Wales state highway *

Castlereagh Street Castlereagh Street is a major street located in the Sydney central business district in New South Wales, Australia. The street runs north-to-south, in a One-way traffic, one way direction only. Description Castlereagh Street's northern terminu ...

, a street in CBD Sydney Other places: * Castlereagh, Nova Scotia, a former village on the Bass River in Nova Scotia, Canada * Castlereagh Dam and Reservoir, in

Nuwara Eliya Nuwara Eliya ( ; ) is a city in the hill country of the Central Province, Sri Lanka. Its name means "city on the plain (table land)" or "city of light". The city is the administrative capital of Nuwara Eliya District, with a picturesque landsc ...

district, Sri Lanka

Other uses

* ''The Castlereagh'' (Gilgandra), an early-20th-century newspaper in New South Wales, Australia {{disambiguation