German submarine U-436 was a Type VIIC U-boat of the Nazi German Kriegsmarine during World War II. She carried out eight patrols. She sank six ships, total 36,208 GRT; and one warship of 291 tons. Two ships were damaged, totalling 15,575 GRT. She was a member of ten wolfpacks. She was sunk by Allied warships in mid-Atlantic, in May 1943.