German submarine U-65

U-65 may refer to one of the following German submarines:


 * SMU U-65 (Germany), a Type U 63 submarine launched in 1916 and that served in the First World War until scuttled on 28 October 1918
 * During the First World War, Germany also had these submarines with similar names:
 * SMU UB-65, a Type UB III submarine launched in 1917 and sunk after 14 July 1918
 * SMU UC-65, a Type UC II submarine launched in 1916 and sunk on 3 November 1917


 * GS U-65 (1940), a Type IXB submarine that served in the Second World War until sunk on 28 April 1941