S23

S23 may refer to:

Aircraft

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

Land transport

• S23 (Long Island bus), New York, U.S.
• S23 (Rhine-Ruhr S-Bahn), Germany
• 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

• Chilean submarine Hyatt
• HMS Repulse, of the U.K.'s Royal Navy
• INS Kalvari, of the Indian Navy
• INS Karanj, of the Indian Navy
• USS S-23 (SS-128), 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