Savnet siden mandag (Missing since Monday) is a Norwegian feature film from 1955 directed by Sigval Maartmann-Moe and Tancred Ibsen. The screenplay was written by Maartmann-Moe, Ibsen, and Axel Kielland. Peter Lindgren and Ivar Svendsen star as the Swede and the missing 17-year-old.

Parts of the footage are from the 1950 film To mistenkelige personer, which was banned by the Norwegian Supreme Court in 1952. The ban was upheld until 2005.