List of U-boat flotillas contains lists of the German U-boat flotillas in the two World Wars. The bases shown here are the ones at which the flotillas spent most of their career. During World War II, submarine flotillas were often tactically deployed, in contrast to the surface flotillas of the Kriegsmarine which were mainly administrative.
This list contains the German U-boats flotillas during the First World War.
| Name | Type | Base | |
|---|---|---|---|
| High Seas Fleet Flotillas | Wilhelmshaven | ||
| Bruges | |||
| Pola Flotilla (Adriatic) | |||
| Kurland Flotilla Baltic Sea | Libau | ||
| Constantinople Flotilla (Black Sea) | Constantinople |
This list contains the German U-boats flotillas during the Second World War. After 1941, the U-boat flotillas were in turn organized into U-boat regions.