Margery Louise Allingham (20 May 1904 – 30 June 1966) was an English novelist from the "Golden Age of Detective Fiction", best remembered for her hero, the gentleman sleuth Albert Campion.

Initially believed to be a parody of Dorothy L. Sayers' detective Lord Peter Wimsey, Campion matured into a strongly individual character, part-detective, part-adventurer, who formed the basis for 18 novels and many short stories.