The Sign of Four
- annos singulos: 1987
- Patriam: United Kingdom
- genus: TV Movie, Adventure, Crime, Mystery, Thriller
- Studio: Granada Television
- keyword: treasure, based on novel or book, river, doctor, sherlock holmes
- Director: Peter Hammond
- cast: Jeremy Brett, Edward Hardwicke, Jenny Seagrove, Ronald Lacey, John Thaw, Emrys James