S6 or S-6 may refer to:
Routes S6 (Berlin), an S-Bahn line in Germany S6 (Milan suburban railway network) line in Italy S6 (Munich), an S-Bahn line in Germany S6 (Rhine-Main S-Bahn) line in Germany S6 (Rhine-Ruhr S-Bahn) line in Germany S6 (St. Gallen S-Bahn) line in the cantons of Glarus and St. Gallen, Switzerland S6 (ZVV), a Zurich S-Bahn line in the cantons of Aargau and Zurich in Switzerland S6, a cross-border line of Basel S-Bahn, Switzerland/Germany S6, a Hanover S-Bahn, line in Germany S6, a Karlsruhe Stadtbahn, line in Germany S6, a Lucerne S-Bahn, line in the cantons of Bern and Lucerne, Switzerland S6, a Rhein-Ruhr S-Bahn, line in Germany S6, a Rhine-Main S-Bahn, line in Germany S6, a Stuttgart S-Bahn, line in Germany S6, a Styria S-Bahn line in Austria S6, a cross-border line of Tyrol S-Bahn, Austria/Germany Line S6 (Beijing Subway), China Line S6 (Nanjing Metro), China Seehas, a regional railway between Konstanz and Engen, Germany Tongmi line in China County Route S6 (California) Expressway S6 (Poland) Essex, a county of England S6 postcode, covering areas of north western Sheffield
Science Ribosomal protein s6 S6: Keep under ... (inert gas to be specified by the manufacturer), a safety phrase in chemistry hexasulfur, a cyclic sulfur allotrope the symmetric group of degree six
Technology Samsung Galaxy S6, a smartphone produced by Samsung Samsung Galaxy Tab S6, an Android tablet S6 NBC Respirator, the protective gas mask issued to the British armed forces from 1966 up until the introduction of the current-issue S10 in 1986 S6 truss, a part of the International Space Station s6 (software), a software suite providing process supervision in Unix-like systems.
Vehicles ALCO S-6, an American diesel switching (shunting) locomotive Audi S6, a car Prussian S 6, a 1906 steam locomotives class Union Pacific Class S-6, an American diesel switching (shunting) locomotive Rans S-6 Coyote II, a light aircraft Supermarine S.6 (1929), and Supermarine S.6B (1931), British racing seaplanes USS S-6 (SS-111), a 1919 S-class submarine of the United States Navy HMS Cachalot (S06), a 1957 British Porpoise-class submarine
Other uses Staff (military), a communications officer within military units Star Air (Denmark), IATA airline designator S6 (classification), a paralympic swimming classification
See also 6S (disambiguation)