SM U-59[Note 1] 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 (55°33′N 7°15′E / 55.550°N 7.250°E / 55.550; 7.250) 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.

[3] The SM U-59 deck gun is on display at the Strandingsmuseum St. George Thorsminde.