S19

S19 may refer to:

Aircraft

 * Letov Š-19, a Czechoslovak airliner
 * Rans S-19 Venterra, an American light sport aircraft
 * Short S.19 Singapore III, a British flying boat
 * SIAI S.19, an Italian racing flying boat
 * Sikorsky S-19, an experimental Russian biplane

Rail and transit

 * S19 (Rhine-Ruhr S-Bahn), an S-Bahn line in Germany
 * S19 (ZVV), a line of the Zürich S-Bahn in Switzerland
 * Aioiyama Station, in Midori-ku, Nagoya, Aichi, Japan
 * Mizue Station, in Edogawa, Tokyo, Japan
 * Niki Station, in Yoichi District, Hokkaido, Japan,
 * Tsuruhashi Station, in Osaka, Japan

Roads

 * S19 Xinnong–Jinshanwei Expressway, China
 * Expressway S19 (Poland)
 * County Route S19 (California), United States

Other uses

 * 40S ribosomal protein S19
 * HMS Opossum (S19), a submarine of the Royal Navy
 * SREC (file format), an ASCII encoding format for binary data developed by Motorola
 * USS S-19 (SS-124), a submarine of the United States Navy
 * British NVC community S19, a swamps and tall-herb fen community in the British National Vegetation Classification system