The Sign on the Door is a 1921 American silent drama film starring Norma Talmadge and Lew Cody. The film was directed and written by Herbert Brenon, and based upon the 1919 play of the same name by Channing Pollock. A copy of this film is in the Library of Congress film archive.

A second adaptation of the play was filmed in 1929 as The Locked Door, starring Barbara Stanwyck.