The Big Clock is a 1948 film noir thriller directed by John Farrow, and adapted by renowned novelist-screenwriter Jonathan Latimer from the novel of the same name by Kenneth Fearing.

The black-and-white film is set in New York City and stars Ray Milland and Maureen O'Sullivan. Elsa Lanchester and Charles Laughton appear in the film, as does Harry Morgan, in an early film role, as a hired thug. Noel Neill has an uncredited part as an elevator operator very early in the film.