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 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