What Belongs to Darkness (German: Die Finsternis und ihr Eigentum) is a 1922 German silent drama film directed by Martin Hartwig and starring Karl Etlinger, Erra Bognar, and Fritz Kortner. The film's sets were designed by the art director Alfred Columbus.
| Actor | Role |
|---|---|
 Karl EtlingerProfessor | Professor |
| EErra BognarDaughter of the professor | Daughter of the professor |
 Fritz KortnerGangster | Gangster |
 Walter JanssenYoung man | Young man |
 Hans Adalbert SchlettowPrisoner | Prisoner |
| WWaldemar PotierNot listed | Not listed |
| DDaisy TorrensNot listed | Not listed |