German submarine U-136 was a Type VIIC U-boat of the Nazi German Kriegsmarine during World War II. She was laid down at the Vulkan-Vegesackerwerft in Bremen on 2 October 1940 as 'werk' 15, launched on 5 July 1941 and commissioned on 30 August with Kapitänleutnant Heinrich Zimmermann in command. Her service career began with the commencement of crew training with the 6th U-boat Flotilla on her commissioning date. She became operational on 1 January 1942, also with the 6th flotilla. She sank five ships, with a total of and two warships totalling 1,850 tons. She also damaged one ship of 8,955 GRT.