31st U-boat Flotilla
{{Refimprove|date=January 2014}}
{{Infobox military unit
|unit_name=31. Unterseebootsflottille
|image=
|caption=
|country=Nazi Germany
|type=U-boat flotilla
|branch=Kriegsmarine
|dates=September 1943–May 1945
|command_structure=
|garrison=Hamburg
Wilhelmshaven
Wesermünde
|nickname=
|battles=
|notable_commanders=Korvkpt. Carl Emmermann
|associated units=
}}
31st U-boat Flotilla ("31. Unterseebootsflottille") was a training flotilla ("Ausbildungsflottille") of Nazi Germany's Kriegsmarine during World War II.
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.{{Cite web |url= http://www.uboat.net/flotillas/31flo.htm |title=uboat.net - Boats - Flotillas - 31st Flotilla |work=uboat.net |access-date=13 February 2010| archive-url= https://web.archive.org/web/20100217110906/http://uboat.net/flotillas/31flo.htm| archive-date= 17 February 2010 | url-status= live}}
Flotilla commanders
- Kapitän zur See Bruno Mahn (September 1943–April 1945)
- Korvettenkapitän Carl Emmermann (April–May 1945)
Assigned U-boats
156 U-boats were assigned to this flotilla during its service.
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- {{GS|U-120|1940|2}}
- {{GS|U-121|1940|2}}
- {{GS|U-140|1940|2}}
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- {{GS|U-148|1940|2}}
- {{GS|U-150|1940|2}}
- {{GS|U-151|1940|2}}
- {{GS|U-152|1940|2}}
- {{GS|U-235||2}}
- {{GS|U-236||2}}
- {{GS|U-237||2}}
- {{GS|U-251||2}}
- {{GS|U-276||2}}
- {{GS|U-287||2}}
- {{GS|U-291||2}}
- {{GS|U-316||2}}
- {{GS|U-349||2}}
- {{GS|U-350||2}}
- {{GS|U-367||2}}
- {{GS|U-368||2}}
- {{GS|U-369||2}}
- {{GS|U-397||2}}
- {{GS|U-428||2}}
- {{GS|U-429||2}}
- {{GS|U-430||2}}
- {{GS|U-554||2}}
- {{GS|U-560||2}}
- {{GS|U-612||2}}
- {{GS|U-677||2}}
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- {{GS|U-708||2}}
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- {{GS|U-1101||2}}
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- {{GS|U-1234||2}}
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- {{GS|U-2501||2}}
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- {{GS|U-2526||2}}
- {{GS|U-2527||2}}
- {{GS|U-2528||2}}
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- {{GS|U-2552||2}}
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