SM U-59 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-59 was engaged in the naval warfare and took part in the First Battle of the Atlantic. She struck a German mine and broke into two parts at Horns Reef () at about midnight on 14 May 1917. She lost 33 of her crew; there were 4 survivors. The wreck of U 59 was located in 2002. SM U 59{'}s deck gun is on display at the Strandingsmuseum St. George Thorsminde.