Hermann Warm was a German art director for films. Born in 1889 (died 1976) in Berlin, Germany, Warm was an important figure in the expressionist movement of the 1920s. Warm entered the German film industry in 1912 after working on-stage for a while. As well as doing set work on films such as The Cabinet of Dr. Caligari and Fritz Lang's Destiny, Warm also worked with Danish film director Carl Theodor Dreyer on films including The Passion of Joan of Arc and Vampyr. During World War II, Warm lived in Switzerland and returned to Germany in 1947.