The 6th U-boat Flotilla (German 6. Unterseebootsflottille), also known as Hundius Flotilla, was a front-line unit of the German Kriegsmarine before and during World War II. Formed on 1 October 1938 in Kiel under the command of Korvettenkapitän Werner Hartmann, it was named in honour of Kapitänleutnant Paul Hundius, a U-boat commander during World War I, that died on 16 September 1918 after his U-boat was sunk by depth charges from British steamer Young Crow. The flotilla was disbanded in December 1939.