German submarine U-102

U-102 may refer to one of the following German submarines:


 * SMU U-102, a Type U 57 submarine launched in 1917 and that served in the First World War until sunk between 28 and 30 September 1918
 * During the First World War, Germany also had these submarines with similar names:
 * SMU UB-102, a Type UB III submarine launched in 1918 and surrendered on 22 November 1918; broken up at La Spezia in July 1919
 * SMU UC-102, a Type UC III submarine launched in 1918 and surrendered on 22 November 1918; broken up at Dordrecht in 1922
 * GS U-102 (1940), a Type VIIB submarine that served in the Second World War until sunk on 1 July 1940