S20 may refer to:

Aviation Letov Š-20, a Czechoslovak fighter Rans S-20 Raven, an American light-sport aircraft SABCA S-20, a Belgian aircraft Short S.20 Mercury, a British parasite seaplane Sikorsky S-20, a Russian biplane fighter SPAD S.XX, later the Blériot-SPAD S.20, a French fighter

Electronics Canon PowerShot S20, a digital camera Chrome S20 series, a graphics accelerator Samsung Galaxy S20, a series of smartphones S20, a discontinued music synthesizer from Akai

Rail and transit

Lines S20 (Long Island bus), in Suffolk County, New York, United States S20 (Munich), in Germany S20 (RER Fribourg), in Switzerland S20 (St. Gallen S-Bahn), a St. Gallen S-Bahn rush-hour service, Switzerland S20 (TILO), in Ticino, Switzerland S20 (ZVV), rush-hour service of the Zurich S-Bahn, Switzerland

Stations Kamisawa Station (Nagoya), in Midori-ku, Nagoya, Aichi, Japan Imazato Station (Osaka Metro), in Japan Shikaribetsu Station, in Niki, Yoichi District, Hokkaidō, Japan Shinozaki Station, in Edogawa, Tokyo, Japan

Roads S20 Shanghai Outer Ring Expressway, China County Route S20 (California), United States

Submarines

, a submarine of the Royal Navy , a submarine of the Indian Navy Type S20 submarine, an export version of China's Type 039A submarine , a submarine of the United States Navy

Homoglyphic errors for S2O S2O, disulfur monoxide S2O, Subscribe to Open, one of dozens of business models for open access

Other uses 40S ribosomal protein S20 British NVC community S20, a natural habitat of swamps and tall-herb fens in the British National Vegetation Classification system Nissan S20 engine, an automobile engine S20: When using do not eat or drink, a safety phrase Sako S20, a Finnish bolt-action rifle Toyota Crown (S20), a luxury sedan Venda language S20, a postcode district in Sheffield, England