German submarine U-209 was a Type VIIC U-boat of the Kriegsmarine during World War II. The submarine was laid down on 28 November 1940 by the Friedrich Krupp Germaniawerft yard at Kiel as yard number 638, launched on 28 August 1941 and commissioned on 11 October under the command of Kapitänleutnant Heinrich Brodda. She was lost in May 1943, possibly due to a diving accident.