U-2 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-2 (Germany), a unique submarine launched in 1908 that served in the First World War as a training submarine and was scrapped in 1919
- During the First World War, Germany also had these submarines with similar names:
- SM UB-2, a Type UB I submarine launched in 1915 and scrapped in 1919
- SM UC-2, a Type UC I submarine launched in 1915 and sunk on 30 June 1915
The Type UB I submarine was a class of small coastal submarines (U-boats) built in Germany at the beginning of the First World War. 20 boats were constructed, most of which went into service with the German Imperial Navy. Boats of this design were also operated by the Austro-Hungarian Navy and the Bulgarian Navy. In the Austro-Hungarian Navy, it was called the U-10 class.
SM UC-2 was a German Type UC I minelayer submarine or U-boat in the German Imperial Navy during World War I. The U-boat had been ordered by November 1914 and was launched on 12 May 1915. She was commissioned into the German Imperial Navy on 17 May 1915 as SM UC-2. Mines laid by UC-2 in her two patrols were not credited with sinking any ships.
The Type UC I coastal submarines were a class of small minelaying U-boats built in Germany during the early part of World War I. They were the first operational minelaying submarines in the world. A total of fifteen boats were built. The class is sometimes also referred to as the UC-1 class after SM UC-1, the class leader.
- During the First World War, Germany also had these submarines with similar names:
- German submarine U-2 (1935), a Type IIA submarine that served in the Second World War and was sunk on 8 April 1944
- German submarine U-2 (1962), a Type 201 submarine of the Bundesmarine, launched in 1962
- German submarine U-2 (1966), a Type 205 submarine of the Bundesmarine that was launched in 1966 and sold in 1993
SM U-2 was a German U-boat built for the Imperial German Navy. Only one of the type, sometimes called German Type U 2 submarine, was built. U-2 was ordered from Kaiserliche Werft of Danzig on 4 March 1906, launched on 18 June 1908, and commissioned into the Imperial German Navy on 18 July 1908. She conducted no war patrols and spent World War I as a training platform.
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.
SM UB-2 was a German Type UB I submarine or U-boat in the German Imperial Navy during World War I. She sank eleven ships during her career and was broken up in Germany in 1920.
U-2 or U-II may also refer to:
- SM U-2 (Austria-Hungary), a U-1 class Austro-Hungarian Navy submarine
SM U-2 or U-II was the second ship of the U-1 class of submarines or U-boats built for and operated by the Austro-Hungarian Navy. U-2 was designed by American naval architect Simon Lake of the Lake Torpedo Boat Company, and constructed at the navy yard in Pola. She was one of two Lake-designed submarines purchased as part of a competitive evaluation of foreign submarine designs after domestic proposals were rejected by the Navy.
  | This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists. |