Kristian Welhaven (11 October 1883 – 27 July 1975) was a Norwegian police officer. He was chief of police of Oslo for 27 years, from 1927 to 1954. He was a leading force in establishing an organized Norwegian intelligence service before World War II, and in re-establishing it after the war. During the war years Welhaven was arrested by the Germans and imprisoned in both Norway and Germany, before spending the remainder of the war as a civilian internee in Bavaria.