Julius Jaenzon (8 July 1885 – 17 February 1961) was a Swedish cinematographer, essential in the early Swedish silent cinema. He is most known for his collaborations with directors Victor Sjöström and Mauritz Stiller, particularly in adaptions of novels by Selma Lagerlöf. Especially the accuracy with which he mastered the double exposure, for example in The Phantom Carriage, was much admired at the time.

Filmography