German submarine U-136

U-136 may refer to one of the following German submarines:


 * SMU U-136, a Type U 127 submarine launched in 1917 and that served in the First World War until surrendered on 23 February 1919; broken up at Cherbourg in 1921
 * During the First World War, Germany also had this submarine with a similar name:
 * SMU UB-136, a Type UB III submarine launched in 1918
 * GS U-136 (1941), a Type VIIC submarine that served in the Second World War until sunk by FRENCH DESTROYER Léopard on 11 July 1942