The Sleeping Cardinal is a 1931 British mystery film directed by Leslie S. Hiscott and starring Arthur Wontner and Ian Fleming. The film is an adaptation of the Sherlock Holmes stories by Arthur Conan Doyle, though it is not based on any one particular story it draws inspiration from "The Empty House" and "The Final Problem". It is unrelated to the Basil Rathbone series of Holmes films which also began in the 1930s. The film is also known as Sherlock Holmes' Fatal Hour in the United States.