Walter Ruttmann (28 December 1887 – 15 July 1941) was a German cinematographer and film director, and along with Hans Richter, Viking Eggeling and Oskar Fischinger was the most important German representative of abstract experimental film. He is best known for directing the semi-documentary 'city symphony' silent film Berlin: Symphony of a Metropolis. His audio montage Wochenende (1930) is considered a major contribution in the development of audio plays.