The Castle (novel) (Das Schloß) is a 1922 novel by Franz Kafka and its translations

Newcastle-under-Lyme, known simply as "castle" to many local people

University College, Durham, commonly known as "castle"

The Castle (film), a 1997 Australian comedy film

Castle Bravo, its first test

Operation Castle, a series of nuclear tests conducted in 1954

GWR 4073 Class, the "Castle" class of steam locomotive

Castles (video game), released by Interplay in 1991

Castle class corvettes, the follow on to the Flower class corvette of World War Two

Castling, a move in chess involving the Rook

Castle, Swansea, an electoral ward in Swansea, Wales

Rook (chess), a chess piece sometimes (formerly or informally) known as the "castle"

Castles II: Siege and Conquest, a 1992 sequel to the above game

Smithsonian Institution Building, in Washington, D.C., nicknamed "The Castle"

Castle Building Centres Group Ltd., Canadian retailers of lumber and building materials

The Castle (radio series), 2007 BBC radio comedy set in the Middle Ages

Castle, Oklahoma, a town

Castle Project, an application framework for the .Net platform

Castle (novel), the second book in The Seventh Tower series

Castles (estate agents), in the UK

Castle (card game)

Castle Communications, a record label

The Castle (game), a videogame made by ASCII corporation

A castle is a fortified structure used to defend a territory; see also, List of castles. Castle or Castles may also refer to: