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

  • , a submarine of the Royal Navy
  • , a torpedo boat of the Imperial German Navy
  • , a submarine of the United States Navy

Other uses

  • 40S ribosomal protein S18
  • County Route S18 (California), United States
  • Riich M1, a subcompact car also marketed as Chery S18
  • 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