Conrad Wiene (born 3 February 1878 – 1934) was an actor, screenwriter, film producer and director of Austrian and German silent film. He was a younger brother of German film director Robert Wiene (The Cabinet of Dr. Caligari).
Conrad Wiene was born in Vienna, younger son of the successful actor Carl Wiene, in whose footsteps Conrad initially followed as a stage and screen actor. He co-directed his first films with his older brother Robert, and later made almost twenty feature films, mostly silent. On most of them he also wrote the screenplays.
He worked in Berlin, Prague and Breslau (Wrocław) and above all in Vienna, where several of his silent films were shot in the Schönbrunn Studios (Schönbrunn-Ateliers).
His name was connected with the first proposal in 1930 in Vienna to film Lion Feuchtwanger's 1925 historical novel Jud Süß ("Jew Süss"), but the project never reached the production stage.
With the arrival and dominance of sound film, Wiene worked in Germany. After Adolf Hitler took power in Germany in 1933, Wiene left Berlin for Vienna. His subsequent fate is unknown.