German submarine U-68

U-68 may refer to one of the following German submarines:


 * SMU U-68, a Type U 66 submarine launched in 1915 and that served in the First World War until sunk 22 March 1916
 * During the First World War, Germany also had these submarines with similar names:
 * SMU UB-68, a Type UB III submarine launched in 1917 and sunk on 4 October 1918
 * SMU UC-68, a Type UC II submarine launched in 1916 and sunk on 17 March 1917
 * GS U-68 (1940), a Type IXC submarine that served in the Second World War until sunk on 10 April 1944