The Solitary Sin
- annos singulos: 1919
- Patriam: United States of America
- genus: Drama
- Studio: New Art Film Company, Solitary Sin Corporation, Public Welfare Pictures Corp.
- keyword: insane asylum, hospital, masturbation, syphilis, sexually transmitted disease, venereal diseases
- Director: Frederick Sullivan
- cast: Jack Mulhall, Helene Chadwick, Gordon Griffith, Leo Pierson, Pauline Curley, Charles Spere
