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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.

World War I

This list contains the German U-boats flotillas during the First World War.

U-boat flotillas of World War I
Name	Type	Base
High Seas Fleet Flotillas	*	Wilhelmshaven
Flanders Flotillas	*	Bruges
Pola Flotilla (Adriatic)	*	Pula, Cattaro
Kurland Flotilla Baltic Sea	*	Libau
Constantinople Flotilla (Black Sea)	*	Constantinople

World War II

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.

U-boat flotillas of World War II
Name	Type	Base
1st U-boat Flotilla	Combat	Brest
2nd U-boat Flotilla	Combat	Lorient
3rd U-boat Flotilla	Combat	La Rochelle
4th U-boat Flotilla	Training	Stettin
5th U-boat Flotilla	Training	Kiel
6th U-boat Flotilla	Combat	St. Nazaire
7th U-boat Flotilla	Combat	St. Nazaire
8th U-boat Flotilla	Training	Danzig
9th U-boat Flotilla	Combat	Brest
10th U-boat Flotilla	Combat	Lorient
11th U-boat Flotilla	Combat	Bergen
12th U-boat Flotilla	Combat	Bordeaux
13th U-boat Flotilla	Combat	Trondheim
14th U-boat Flotilla	Combat	Narvik
18th U-boat Flotilla	Training	Hela
19th U-boat Flotilla	Training	Pillau
20th U-boat Flotilla	Training	Pillau
21st U-boat Flotilla	Training	Pillau
22nd U-boat Flotilla	Training	Gotenhafen
23rd U-boat Flotilla	Combat/Training	Salamis/Danzig
24th U-boat Flotilla	Training	Memel
25th U-boat Flotilla	Training	Libau
26th U-boat Flotilla	Training	Pillau
27th U-boat Flotilla	Training	Gotenhafen
29th U-boat Flotilla	Combat	La Spezia
30th U-boat Flotilla	Combat	Konstanza
31st U-boat Flotilla	Training	Hamburg
32nd U-boat Flotilla	Training	Königsberg
33rd U-boat Flotilla	Combat	Flensburg