30th U-boat Flotilla
| 30. Unterseebootsflottille | |
|---|---|
| Active | Raised 1942, Dissolved 1944 |
| Country | Nazi Germany |
| Branch | Kriegsmarine |
| Type | U-boat flotilla |
| Garrison/HQ | Constanţa |
| Commanders | |
| Notable commanders | Helmut Rosenbaum |
30th U-boat Flotilla ("30. Unterseebootsflottille") of Nazi Germany's Kriegsmarine was formed in October 1942. Six U-boats reached the Black Sea after a transport over land and canals and operated from the harbours of Constanţa and Feodosiya from 1942 to 1944.