The Citadel may be:

• The Citadel, a 1937 novel by Scottish author A.J. Cronin
• The Citadel, a 1938 film based on the novel
• The Citadel, two 1960 U.S. and one 1983 BBC adaptations of the novel
• The Citadel, a diving spot in Martinique
• The Citadel, a fictional alien empire from DC Comics' Omega Men
• The Citadel, The Military College of South Carolina, a liberal arts college in South Carolina
• The Citadel, the Vietnamese royal residence at Hué
• The Citadel of Quebec, a fortress in Quebec City
• The Citadel, a giant tower in the computer game Half-Life 2.

The Citadel is a novel by A. J. Cronin, first published in 1937 (in Britain by Gollancz, July, and in the US by Little, Brown, & Co. ... A. J. Cronin is the pen-name of the Scottish novelist Archibald Joseph Cronin (July 19, 1896 - January 9, 1981). ... The Citadel is a novel by A. J. Cronin, first published in 1937, turned into a 1938 film, with two 1960 US and another 1983 BBC television adaptations. ... The Citadel is a novel by A. J. Cronin, first published in 1937, turned into a 1938 film, with two 1960 US and another 1983 BBC television adaptations. ... The Citadel is a world-class diving spot in Martinique. ... The Omega Men are a team of alien comic book superheroes in the DC Comics universe. ... The Citadel, The Military College of South Carolina, is a state-supported, comprehensive college with 14 academic departments divided into five schools offering 20 majors and 23 minors. ... The Citadel (fr: Citadelle) is a military fort atop Cape Diamant, adjoining the Plains of Abraham in Quebec City, Quebec, Canada. ... This is a list of non-combat technology employed by the Combine empire in Half-Life 2, a 2004 first-person shooter. ... A computer game is a game composed of a computer-controlled virtual universe that players interact with in order to achieve a defined goal or set of goals. ... Half-Life 2 is a science fiction first-person shooter computer game and the sequel to Half-Life, developed by Valve Corporation. ...

See also

• Royal Citadel
• The Tower of David, an Ottoman tower in the old city of Jerusalem

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