|Active||September 1943–May 1945|
|Korvkpt. Carl Emmermann|
The flotilla was formed in Hamburg in September 1943 under the command of Kapitän zur See Bruno Mahn. Later based at Wilhelmshaven, and then Wesermünde, it was commanded by Carl Emmermann for the final month of the war. It was disbanded in May 1945 when Germany surrendered.
- Kapitän zur See Bruno Mahn (September 1943–April 1945)
- Korvettenkapitän Carl Emmermann (April–May 1945)
156 U-boats were assigned to this flotilla during its service.
- "uboat.net - Boats - Flotillas - 31st Flotilla". uboat.net. Archived from the original on 17 February 2010. http://web.archive.org/web/20100217110906/http://uboat.net/flotillas/31flo.htm. Retrieved 13 February 2010.
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