U 6
U6 or u 6 stands for:
- Udet U 6 , German aircraft from Udet Flugzeugbau
- Ural Airlines (IATA code), a Russian airline
- a child screening examination
U6 denotes the following underground lines:
U 6 is the name of the following submarines:
- SM U 6 (1910–1915), a submarine of the German Imperial Navy
- U 6 (kuk Marine) (1910–1916), a submarine of the Austro-Hungarian Navy
- U 6 (Kriegsmarine) (1935–1944), a submarine of the German Kriegsmarine
- U 6 (Bundeswehr) (1963–1974), a submarine of the German Navy
