German submarine U-2 explained

U-2 may refer to one of the following German submarines:

• , 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:
    • , a Type UB I submarine launched in 1915 and scrapped in 1919
    • , a Type UC I submarine launched in 1915 and sunk on 30 June 1915
• , a Type IIA submarine that served in the Second World War and was sunk on 8 April 1944
• , a Type 201 submarine of the Bundesmarine, launched in 1962
• , a Type 205 submarine of the Bundesmarine that was launched in 1966 and sold in 1993

U-2 or U-II may also refer to:

• , a U-1 class Austro-Hungarian Navy submarine