S7

S7 may refer to:

Materials

• S7 aka S-7, a grade of tool steel
• heptasulfur (S₇), a cyclic allotrope of sulfur

Media

• Sovereign Seven, a superhero team and comicbook published by DC Comics in 1995-1998
• Samurai 7, a 2004 anime series

Technology

• Simatic S7 PLC, an automation system based on Programmable Logic Controller from Siemens, successor to Simatic S5 PLC
• Sub7, a computer backdoor

Transport

• Saleen S7, a limited production American sports car manufactured by Saleen, Incorporated
• HMS Sealion (S07), a 1959 British Porpoise-class submarine
• USS S-7 (SS-112), a 1920 S-class submarine of the United States Navy

Aircraft

• S7 Airlines, a Russian airline
• Ambrosini S.7, an Italian racing aircraft flown before World War II
• Rans S-7 Courier, a light aircraft

Rail

• S7 (Berlin), a S-Bahn line
• S7 (Munich), a S-Bahn line in Munich
• S7 (Rhine-Ruhr S-Bahn) line
• S7 (ZVV), a regional railway line of the Zürich S-Bahn
• London Underground S7 Stock, a type of train on London Underground that will start operation on the Circle Line during 2012
• Prussian S 7, a Prussian steam locomotives class

Roadways

• County Route S7 (California)
• Expressway S7 (Poland)

Mathematics and physics

• S⁷, the 7-sphere

Other uses

• S7: Keep container tightly closed, a safety phrase in chemistry
• S7 postcode, a postcode covering areas of southern Sheffield
• British NVC community S7, a swamps and tall-herb fens community in the British National Vegetation Classification system