Sin is a 1915 American silent drama film written and directed by Herbert Brenon and starring Theda Bara.

[2] In order to underscore and further enhance Theda Bara's image as a "vamp", Fox Film Corporation publicized the film with the tagline "Sin With Theda Bara!".

[3] Upon its release, Sin was an enormous hit with audiences and Bara earned generally good reviews for her performance.

Despite its success in other locations, the film was banned in Ohio and Georgia due to its themes of suicide, lust, Roman Catholic sacrilege, and love triangles.

The Pittsburgh Board of Welfare condemned the film as did the Kansas Board of Censorship, although the latter apparently still allowed the film's presentation in Kansas theaters.