Detective is a British mystery anthology television series adapted from stories by numerous prominent crime fiction writers, with each episode focusing on a particular detective character. Several prominent fictional sleuths were showcased, including Sherlock Holmes, Dr. John Thorndyke, Philip Trent, Sir Henry Merrivale, Roderick Alleyn, Father Brown, Albert Campion, C. Auguste Dupin, Sir John Appleby, Inspector Ghote, Nigel Strangeways and Gervase Fen.

Many of the episodes were introduced by Rupert Davies, in-character as Inspector Maigret, reprising his role from the eponymous BBC series that had aired from 1960 to 1963. Several episodes functioned as Backdoor pilots for potential future series. Of the 45 episodes, only three such shows were produced as a result: Cluff (1964–65) starring Leslie Sands, Thorndyke (1964) starring Peter Copley, and Sherlock Holmes (1965–68) starring Douglas Wilmer, and later, Peter Cushing.

Of the eighteen episodes from the first series twelve are currently known to exist; nine episodes from series two survive; while only one episode from the third series remains in the archive.