Oscar Rosander (25 July 1901 - 7 May 1971) was a Swedish film editor with more than 100 feature film credits. He was born in Eksjö, Sweden in 1901. He studied modern languages at Uppsala University and later worked with film dubbing and editing for the Swedish film studio Svensk Filmindustri.Rosander had an extended, notable collaboration on twelve films with the director Ingmar Bergman, including Bergman's debut film Crisis (1946) as well as Smiles of a Summer Night (1955), Wild Strawberries (1957), The Magician (1958), and The Virgin Spring (1960). In his autobiography, Bergman credits Rosander with teaching him the possibilities of editing and of "editing behind the camera".He died at Las Palmas, Canary Islands, in 1971.
Legendary Swedish director Ingmar Bergman gives great credit in his memoirs The Magic Lantern to Rosander (who edited his directorial debut, Crisis (1946), as well as eleven subsequent films of his) for being a formative influence when he was a fledgling director at Svensk Filmindustri. He also mentions, rather oddly, that Rosander possessed an extremely thorough collection of pornographic pictures, and he repeats an apparently popular rumour that Rosander apparently frequented the same prostitute at least twice a week over a period of twenty-three years.