U-156 may refer to one of the following German submarines:
Germany, officially the Federal Republic of Germany, is a country in Central and Western Europe, lying between the Baltic and North Seas to the north, and the Alps to the south. It borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, France to the southwest, and Luxembourg, Belgium and the Netherlands to the west.
- SM U-156, a Type U 151 submarine launched in 1917; served in World War I until sunk on 25 September 1918
- German submarine U-156 (1941), a Type IXC submarine that served in World War II until sunk on 8 March 1943
SM U-156 was a German Type U 151 U-boat commissioned in 1917 for the Imperial German Navy. From 1917 until her disappearance in September 1918 she was part of the U‑Kreuzer Flotilla, and was responsible for sinking 44 ships and damaging three others, including a warship. She took part in the Attack on Orleans.
Type U 151 U-boats were a class of large, long-range submarines initially constructed during World War I to be merchant submarines and later used by the Kaiserliche Marine.
World War I, also known as the First World War or the Great War, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. Contemporaneously described as "the war to end all wars", it led to the mobilisation of more than 70 million military personnel, including 60 million Europeans, making it one of the largest wars in history. It is also one of the deadliest conflicts in history, with an estimated nine million combatants and seven million civilian deaths as a direct result of the war, while resulting genocides and the 1918 influenza pandemic caused another 50 to 100 million deaths worldwide.
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