Sherlock, Jr. is a 1924 comedy short film which tells the story of a movie projectionist who is accused of stealing his girlfriend's father's watch. He falls asleep on the job and dreams that he is Sherlock Holmes solving the case. It stars Buster Keaton, Kathryn McGuire, Joe Keaton and Ward Crane.

The movie was written by Clyde Bruckman, Jean C. Havez and Joseph A. Mitchell. It was directed by Keaton. The film has been deemed "culturally significant" by the United States Library of Congress and selected for preservation in the National Film Registry.