S12

S12 may refer to:

Aviation

 * Albany Municipal Airport (Oregon), in Linn County, Oregon, United States
 * Letov Š-12, a Czechoslovakian prototype fighter aircraft
 * Rans S-12 Airaile, an American civil utility aircraft
 * SABCA S.XII, a Belgian passenger aircraft
 * SIAI S.12, an Italian flying-boat
 * Sikorsky S-12, a Russian trainer aircraft
 * SPAD S.XII, a French biplane fighter
 * Spencer S-12 Air Car, an American amphibious aircraft
 * Stemme S12, a German motor glider

Lines

 * S12 (Rhine-Ruhr S-Bahn), Germany
 * S12 (St. Gallen S-Bahn), Switzerland
 * S12 (ZVV), Zürich, Switzerland
 * Line S12 (Milan suburban railway service), Italy

Locomotives

 * Baldwin S-12, a diesel-electric locomotive
 * Sri Lanka Railways S12, a diesel multiple unit

Stations

 * Asari Station (Hokkaido), in Otaru, Hokkaido, Japan
 * Bang Wa station, in Bangkok, Thailand
 * Iyo-Nagahama Station, in Ōzu, Ehime Prefecture, Japan
 * Kikukawa Station, in Sumida, Tokyo, Japan
 * Mizuho Kuyakusho Station, in Mizuho-ku, Nagoya, Aichi Prefecture, Japan
 * Myōdani Station, in Suma-ku, Kobe, Hyōgo Prefecture, Japan

Roads

 * Airport Expressway (Beijing), China
 * Shanghai–Jiaxing–Huzhou Expressway, China
 * S12 highway (Georgia)
 * Expressway S12 (Poland)
 * County Route S12 (California), United States

Vessels

 * BRAZILIAN SUBMARINE Bahia, in service 1963–1972
 * BRAZILIAN SUBMARINE Bahia, in service 1972–1993
 * HMCS Caribou (S12), an armed yacht of the Royal Canadian Navy
 * HMS Olympus (S12), a submarine of the Royal Navy
 * USS S-12 (SS-117), a submarine of the United States Navy

Other uses

 * S12 (classification), a disability swimming classification
 * 40S ribosomal protein S12
 * British NVC community S12, a swamps and tall-herb fens community in the British National Vegetation Classification system
 * Lenovo IdeaPad S12, a laptop
 * Nissan Silvia (S12), a sports car
 * S12: Do not keep the container sealed, a safety phrase
 * Saiga-12, a Russian semi-automatic shotgun
 * S12, a postcode district in Sheffield, England