U17 or U-17 may refer to:
U-28 may refer to one of the following German submarines:
U-32 may refer to one of the following German submarines:
U-5 may refer to one of the following German submarines:
German submarine U-40 may refer to one of the following German submarines:
U-41 may refer to one of the following German submarines:
U-1 may refer to one of the following German submarines:
U-6 may refer to one of the following German submarines:
U-43 may refer to one of the following German submarines:
U-29 may refer to one of the following German submarines:
U-7 may refer to one of the following submarines:
U-47 may refer to one of the following German submarines:
U-15 may refer to one of the following German submarines:
U-23 may refer to one of the following German submarines:
U-30 may refer to one of the following German submarines:
U-31 may refer to one of the following German submarines:
U-4 may refer to one of the following German submarines:
U-2 may refer to one of the following German submarines:
U-3 may refer to one of the following German submarines:
U-27 may refer to one of the following German submarines:
SM U-9 (Austria-Hungary) may refer to one of the following World War I German U-boats: