S23

• Short S.23, a British flying boat • Sikorsky S-23, a Russian bomber == Land transport ==

• S23 (Long Island bus), New York, U.S. • S23 (Cologne S-Bahn), Germany • S23 (St. Gallen S-Bahn), an S-Bahn service operating over the Gossau–Wasserauen railway line, Switzerland • S23 (ZVV), a Zurich S-Bahn service, Switzerland • S23, an Aargau S-Bahn line, Switzerland • Kita-Tatsumi Station, Osaka, Japan • Kutchan Station, Hokkaido, Japan == Law ==

• Patent Reform Act of 2011, a failed bill of the U.S. Congress • S23: Do not breathe gas/fumes/vapour/spray (appropriate wording to be specified by the manufacturer), in the E.U. Dangerous Substances Directive == Medicine ==

• S-23 (drug), a selective androgen receptor modulator • 40S ribosomal protein S23 == Submarines ==

• • , of the U.K.'s Royal Navy • , of the Indian Navy • , of the Indian Navy • , of the U. S. Navy == Other uses ==

• 180 mm gun S-23, a Soviet heavy gun • British NVC community S23, a designation for swamp and fen habitats • Samsung Galaxy S23, a 2023 series of smartphones • Special publication S-23 of the International Hydrographic Organization (IHO) named Limits of Oceans and Seas