The Island of the Lost is a 1921 German silent science fiction film directed by Urban Gad and starring Alf Blütecher, Hanni Weisse and Erich Kaiser-Titz. It is a loose unauthorized adaptation of the 1896 novel The Island of Doctor Moreau by H. G. Wells. Wells was allegedly unaware that this unauthorized version of his novel existed. It was a common practice in the silent era for European filmmakers to produce unauthorized versions of famous works of literature, as evidenced by F. W. Murnau's Der Januskopf (1920) and Nosferatu (1922).