S17
S17 may refer to:

Aviation
Rans S-17 Stinger, an American ultralight aircraft
Saab 17, a Swedish reconnaissance aircraft
Short S.17 Kent, a British flying boat airliner
SIAI S.17, an Italian racing flying boat
Sikorsky S-17, a Russian biplane
Twin Lakes Airport (South Carolina), in Aiken County, South Carolina, United States

Rail and transit
Funabori Station, in Edogawa, Tokyo, Japan
Gorō Station, in Ōzu, Ehime Prefecture, Japan
Nippombashi Station, in Chūō-ku, Osaka, Japan
Nonami Station, in Tempaku-ku, Nagoya, Aichi Prefecture, Japan
Ranshima Station, in Otaru, Hokkaido, Japan
Wohlen–Dietikon railway line, of the Zürich S-Bahn

Roads
S17 Baicheng Ring Expressway, China
Expressway S17 (Poland)
County Route S17 (California), United States

Vessels
Greek submarine Amfitriti (S-17)
HMS Ocelot (S17), a submarine of the Royal Navy
SMS S17 (1912), a torpedo boat of the Imperial German Navy
USS S-17 (SS-122), a submarine of the United States Navy

Other uses
40S ribosomal protein S17
British NVC community S17, a swamps and tall-herb fens community in the British National Vegetation Classification system
S17: Keep away from combustible material, a safety phrase
S17, a postcode district in Sheffield, England