German submarine U-136 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.

She was laid down at Vulkan-Vegesackerwerft in Bremen on 2 October 1940 as yard number 15, launched on 5 July 1941 and commissioned on 30 August with Kapitänleutnant Heinrich Zimmermann in command.

The submarine was powered by two MAN 6-cylinder 4-stroke M6V 40/46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged.

Part three involved the boat crossing the North Sea and negotiating the passage between the Faroe and Shetland Islands into the Atlantic Ocean.

During U-136's second patrol, the boat damaged Axtell J. Byles off the US North Carolina coast on 19 April 1942 and sank Empire Drum about 280 nmi (520 km; 320 mi) southeast of New York on the 24th.