Ugler i mosen is a 1959 Norwegian mystery and adventure family film directed by Ivo Caprino. The title, which literally means 'Owls in the Moss', is based on the idiom det er ugler i mosen 'I smell a rat; there is mischief afoot'.The film was written by Caprino as an adaptation of Finn Havrevold's children's book Marens lille ugle (Maren's Little Owl). The leading role was played by 12-year-old Grethe Nilsen, and the film also featured Sverre Hansen, Turid Balke, Kjetil Bang-Hansen, Egil Hjorth-Jenssen and Aud Schønemann.

Animation figures also played central roles in the film.