Hans Janowitz (December 2, 1890 in Podiebrad, Bohemia — May 25, 1954 in New York) was a Bohemian-born German author.Janowitz was an officer in World War I, but returned from it as a pacifist. Shortly after the war ended, he met the similarly minded Carl Mayer in Berlin, who suggested he work as an author. Together they wrote the script to The Cabinet of Dr. Caligari (Das Kabinett des Doktor Caligari), which was filmed by Robert Wiene during 1919 and 1920, and released in February 1920.