The following is a listing of all the U-boat types that served in WWI.

UA

Gasoline-powered boats

U 1 - U 2 - U 3 - U 5 - U 9 - U 13 - U 16 - U 17

Mittel-U

U 19 - U 23 - U 27 - U 31 - U 43 - U 51 - U 57 - U 63 - U 66 - Mittel U

U-Cruisers and Merchant U-boats

U 151 - U 139 - U 142

UB coastal torpedo attack boats

UB I - UB II - UB III

UC coastal minelayers

UC I - UC II - UC III

UE ocean minelayers

UE 1 - UE 2

Shipyards

See all the shipyards that built U-boats before and during WWI.