Sherlock Jr. is a 1924 American silent comedy film starring and directed by Buster Keaton and written by Clyde Bruckman, Jean Havez, and Joseph A. Mitchell. It features Kathryn McGuire, Joe Keaton, and Ward Crane.

Joseph Frank "Buster" Keaton was an American actor, comedian and film director. He is best known for his silent films during the 1920s, in which he performed physical comedy and inventive stunts. He frequently maintained a stoic, deadpan facial expression that became his trademark and earned him the nickname "The Great Stone Face".