Unterseebootsflottille), also referred to as the Wegener Flotilla, was a combat unit within the Kriegsmarine, the naval warfare branch of Nazi Germany.

Founded on 25 June 1938 under the command of Korvettenkapitän Werner Sobe, it was named in honour of Kapitänleutnant Bernd Wegener.

Wegener, a U-boat commander during World War I, died on 19 August 1915 after his submarine U-27 was sunk by British Q-ship HMS Baralong, which was itself a much disputed battle with the Royal Navy accused of war crimes by the German Navy.

According to historical records, the "Wegener Flotilla" was established in Kiel, Germany in June 1938.

U-47 was famous for sinking the British HMS Royal Oak in October 1939.