Places
Australia
* City of Newcastle, a local government area in New South Wales * County of Newcastle, a cadastral unit in South Australia * Division of Newcastle, a federal electoral division in New South Wales * Electoral district of Newcastle, an electoral district of the New South Wales Legislative Assembly * Electoral district of Newcastle (South Australia) 1884–1902, 1915–1956 in the South Australian House of Assembly *Canada
* Newcastle, Alberta, a former village now within the Town of Drumheller * Newcastle, New Brunswick, a former town, now part of Miramichi * Newcastle, Ontario, a community in the Municipality of Clarington in Durham Region * Newcastle District, a historic district in Upper Canada which existed until 1849 * Newcastle Parish, New Brunswick * Newcastle (electoral district), a provincial electoral district in the Canadian province of British ColumbiaRepublic of Ireland
* Newcastle, Clonfad, a townland in Clonfad civil parish, barony of Fartullagh, County Westmeath * Newcastle, County Tipperary * Newcastle, County Wicklow * Newcastle, Dublin * Newcastle, Kilcleagh, a townland in Kilcleagh civil parish, barony of Clonlonan, County Westmeath * Newcastle, Lickbla, a townland in Lickbla civil parish, barony of Fore, County Westmeath * Newcastle West, County LimerickJamaica
* Newcastle, JamaicaSaint Kitts and Nevis
* Newcastle, Saint Kitts and NevisSouth Africa
* Newcastle, KwaZulu-Natal, a city in northern KwaZulu-Natal * Newcastle Local Municipality, administrative area in the Amajuba district in KwaZulu-NatalUnited Kingdom
England
* Newcastle, Shropshire (Newcastle on Clun), a village (and parish) in south Shropshire *Northern Ireland
* Newcastle, County Down, a small town in County Down lying at the foot of the Mourne Mountains an area of outstanding natural beauty.Wales
* Newcastle, Monmouthshire * Newcastle, Bridgend, an area and electoral ward * Newcastle Emlyn, CarmarthenshireUnited States
* New Castle, Alabama, an unincorporated community in Jefferson County * Newcastle, California, an unincorporated town in Placer County * New Castle, Colorado, a home rule municipality in Garfield County * New Castle, Delaware, a city in New Castle County * New Castle County, Delaware, the northernmost of the three counties * New Castle Hundred, an unincorporated subdivision of New Castle County, Delaware * New Castle, Indiana, a city in Henry County * Webster City, Iowa, formerly Newcastle, county seat of Hamilton County * New Castle, Kentucky, a city in Henry County * Newcastle, Maine, a town in Lincoln County ** Newcastle (CDP), Maine, the main village in the town * Newcastle, Nebraska, a village in Dixon County * Newcastle Township, Dixon County, Nebraska, a township in Dixon County * New Castle, New Hampshire, a town in Rockingham County * New Cassel, New York, an unincorporated place in Nassau County * New Castle, New York, a town in Westchester County * New Castle, Ohio, an unincorporated community in Belmont County * Newcastle, Ohio, an unincorporated community in Coshocton County * Newcastle Township, Coshocton County, Ohio, one of the twenty-two townships of Coshocton County * Newcastle, Oklahoma, the largest city in McClain County * New Castle, Pennsylvania, a city in Lawrence County * New Castle Northwest, Pennsylvania, a census-designated place in Lawrence County * New Castle Township, Pennsylvania, a township in Schuylkill County * South New Castle, Pennsylvania, a borough in Lawrence County * Newcastle, Texas, a city in Young County * Newcastle, Utah, an unincorporated community in southwestern Iron County * New Castle, Virginia, the only town in Craig County * Newcastle, Washington, a city in King County * New Cassel, Wisconsin, a former village in Fond du Lac County * Newcastle, Wyoming, a city located in Weston CountyArts and entertainment
* ''Newcastle'' (film), a 2008 Australian film * Newcastle Publishing Company, a Southern California-based small trade paperback publisher * "Newcastle" (''The Architecture the Railways Built''), a 2021 television episode *Newcastle, a playable character in the game ''Buildings and facilities
* Newcastle Castle, Bridgend, a medieval castle in Wales * New Castle Correctional Facility, a prison located in New Castle, Indiana * Newcastle International Sports Centre, a stadium in Newcastle, New South Wales * New Castle School of Trades, a technical trades school in Pulaski, Pennsylvania * New Palace (Stuttgart) (''Das Neues Schloss'', sometimes translated as the "New Castle"), a palace in Stuttgart, GermanySport
Football clubs
* Newcastle Jets FC, an Australian association football club in Newcastle, NSW * Newcastle United F.C., an English association football club based in Newcastle upon Tyne * Newcastle Falcons, an English rugby union club based in Newcastle upon Tyne * Newcastle Knights, an Australian rugby league team based in Newcastle, New South Wales * Newcastle Thunder, an English rugby league club based in Newcastle upon TyneOther sporting uses
* Newcastle Eagles, the most successful team in the history of the British Basketball League (BBL) * Newcastle International Sports Centre, a stadium in Newcastle, New South WalesTransportation
Air
* Newcastle Airport, several airports of this name * Newcastle International Airport, airport of Newcastle-upon-Tyne, England * New Castle Airport, a public airport located in an unincorporated part of New Castle County, Delaware, United StatesRail
* New Castle District, a railroad line owned and operated by the Norfolk Southern Railway in Ohio and Indiana, United States * Newcastle railway line, New South Wales, Australia, running from BroadmeadowWatercraft
* HMAS ''Newcastle'', an ''Adelaide class frigate'' of the Royal Australian Navy * HMS ''Newcastle'', a name given to eight ships of the British Royal Navy * ''Newcastle'' (clipper), 1857 English shipOther uses
* Duke of Newcastle, a title in the UK * Newcastle Brown Ale, a brand of beer produced by Heineken * Newcastle Building Society, a British financial institution * Newcastle disease, a highly contagious bird disease *Newcastle, an Athlon 64 computer processor core revisionSee also
* Akhaltsikhe ("New Castle"), Georgia * Castelnau (disambiguation) ("New Castle"), places in Occitan-speaking areas * Castelnuovo (disambiguation) ("New Castle"), places in Italian-speaking areas *