The Lodger: A Story of the London Fog is a 1927 British silent thriller film directed by Alfred Hitchcock and starring Marie Ault, Arthur Chesney, June Tripp, Malcolm Keen and Ivor Novello. Hitchcock's third feature film, it was released on 14 February 1927 in London and on 10 June 1928 in New York City. The film is based on the 1913 novel The Lodger by Marie Belloc Lowndes and the play Who Is He? co-written by Belloc Lowndes. Its plot concerns the hunt for a Jack the Ripper-like serial killer in London.

The film was Hitchcock's first thriller, and established his reputation as a director. Upon its release, the trade journal Bioscope wrote: "It is possible that this film is the finest British production ever made". In a strategy for self-publicity, The Lodger saw him make his first cameo appearance in a film, where he sat in a newsroom.