German submarine U-65

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


 * SMU U-65 (Germany), a German Type U 63 submarine
 * During the First World War, Germany also had these submarines with similar names:
 * SMU UB-65, a German Type UB III submarine
 * SMU UC-65, a German Type UC II submarine
 * GS U-65 (1940), a German Type IXB submarine