|Active||June 1943–February 1945|
|Korvkpt. Ernst Mengersen|
The flotilla was formed in Pillau, in June 1943 under the command of Korvettenkapitän Ernst Mengersen, and specialised in tactical training (Vortaktische Ausbildung). It was disbanded in February 1945.
- "uboat.net - Boats - Flotillas - 20th Flotilla". uboat.net. Archived from the original on 17 February 2010. http://web.archive.org/web/20100217012157/http://www.uboat.net/flotillas/20flo.htm. Retrieved 13 February 2010.
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