U 17
U 17 stands for:
- an age group in sports; see age and performance classes (sport)
- an Essen subway line, see Essen Stadtbahn
U 17 denotes several submarines:
- SM U 17 (1912–1919), a submarine of the German Imperial Navy
- U 17 (kuk Marine) (1915–1919), a submarine of the Austro-Hungarian Navy
- U 17 (Kriegsmarine) (1935–1945), a submarine of the German Kriegsmarine
- U 17 (Bundeswehr) (1973-2010), a submarine of the submarine class 206 of the German Navy
