S18

S18 may refer to:

Aviation

• Forks Airport, in Clallam County, Washington, United States
• Letov Š-18, a Czechoslovak biplane trainer
• Rans S-18 Stinger II, an American ultralight
• Saab 18, a Swedish bomber and reconnaissance aircraft
• Sikorsky S-18, a Russian biplane
• Spalinger S.18, a Swiss sailplane
• Thorp S-18, an American homebuilt aircraft

Rail and transit

• Forch railway, a line of the Zürich S-Bahn
• Ichinoe Station, in Edogawa, Tokyo, Japan
• Iyo-Ōzu Station, in Ōzu, Ehime Prefecture, Japan
• Naruko Kita Station, in Tempaku-ku, Nagoya, Aichi Prefecture, Japan
• Tanimachi Kyūchōme Station, in Ikutamamaemachi, Tennōji-ku, Osaka, Japan
• Yoichi Station, in Yoichi, Hokkaido, Japan

Vessels

• HMS Otus (S18), a submarine of the Royal Navy
• SMS S18 (1912), a torpedo boat of the Imperial German Navy
• USS S-18 (SS-123), a submarine of the United States Navy

Other uses

• 40S ribosomal protein S18
• County Route S18 (California), United States
• S18: Handle and open container with care, a safety phrase
• S-18 85 mm gun, a Soviet tank gun
• S18, a postcode district in Dronfield, England