Hatter's Castle is a 1942 British film noir based on the 1931 novel Hatter's Castle by A. J. Cronin, which dramatizes the ruin that befalls a Scottish hatter set on recapturing his imagined lost nobility. The film was made by Paramount British Pictures and stars Robert Newton, Deborah Kerr, James Mason, and Emlyn Williams. It is believed to be the only film that depicts the Tay Bridge disaster.

Archibald Joseph Cronin, known as A. J. Cronin, was a Scottish physician and novelist. His best-known novel is The Citadel (1937), about a Scottish doctor who serves in a Welsh mining village before achieving success in London, where he becomes disillusioned about the venality and incompetence of some doctors. Cronin knew both areas, as a medical inspector of mines and as a doctor in Harley Street. The book exposed unfairness and malpractice in British medicine and helped to inspire the National Health Service.