MT Gustaf E. Reuter was a 6,336 ton Swedish motor tanker belonging to the company Rederi AB Reut. She was built in 1928 by the Eriksbergs Mekaniska Verkstad shipyard in Gothenburg. On a voyage from Haugesund to Curaçao she was torpedoed and sunk by the U-boat GS U-48 (1939) at 00.30 on 27 November 1939 at the position 59.63333°N, -2.05°W, 14 miles west-northwest from Fair Isle, in Shetland, Scotland, and broke in two. The wreck was sunk by an escort vessel the next day. One person died while 33 survived.