S12

S12, S.XII, S-12 or S.12 may refer to:

In military 

• SABCA S-12, a Belgian aircraft
• SIAI S.12, an Italian 1910s reconnaissance flying-boat
• SPAD S.XII, a French single-seat biplane fighter aircraft of the First World War
• USS S-12 (SS-117), a 1921 S-class submarine of the United States Navy

In transportation 

• S12 Chassis, pertaining to the 1984-88 Nissan Silvia/200SX
• S12 postcode, covering areas of south eastern Sheffield
• Baldwin S-12, a 1951 1,200 horsepower (890 kW) diesel-electric locomotive
• Rans S-12 Airaile, ultralight aircraft

Roads 

• S12 (ZVV), a S-Bahn line in the cantons of Zürich and Zug in Switzerland
• County Route S12 (California), a road in California
• Expressway S12 (Poland)
• Airport Expressway (Beijing)

In science and academia 

• British NVC community S12, a swamps and tall-herb fens community in the British National Vegetation Classification system
• S12: Do not keep the container sealed, a safety phrase in chemistry

other 

• S12 (classification), a swimmer classification in disability swimming
• an S-Parameter in a 2-port RF network
• Albany Municipal Airport in Albany, Oregon FAA airport identifier
• also known as Simple Vinyl, a London-based independent record label
• S12 (Rhine-Ruhr S-Bahn) line

S₁₂ may refer to :

• a cyclic allotrope of sulfur