The Citadel has several meanings:

• A military college in South Carolina
• A fortress in Quebec City
• A novel & film
• A residence for Hué

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Fortress

The Citadel is a fortress in Quebec City that serves both as a military installation and as a vice-regal residence. See La Citadelle.

Novel

The Citadel is also the name of a novel by A. J. Cronin, first published in 1937 and turned into a 1938 film. It told the story of a young idealistic doctor who becomes seduced by the thought of easy money from wealthy clients, rather than the good works that he originally set out to do. Cronin draws on his own experiences as a doctor in the industrial valleys of South Wales.

The film starred Robert Donat, Rosalind Russell, Ralph Richardson, Rex Harrison and Emlyn Williams. It was written by Ian Dalrymple , Frank Wead, Elizabeth Hill and Emlyn Williams. It was directed by King Vidor, and was nominated for the Academy Award for Best Picture.

The book has also been adapted for television.

Residence of Hué

The Citadel was also the Vietnamese royal residence at Hué.