S13 may refer to:
Aviation Beriev S-13, an abandoned Soviet reconnaissance aircraft project Fokker S-13, a German trainer Letov Š-13, a Czechoslovak fighter aircraft SIAI S.13, an Italian reconnaissance biplane Sikorsky S-13, a Russian aircraft design proposal SPAD S.XIII, a French biplane fighter
Automobiles Nissan Silvia (S13), a Japanese sports car Nissan 240SX (S13), a sports car sold in North America
Rail and transit
Lines S13 (Rhine-Ruhr S-Bahn), Germany S13 (ZVV), Zurich, Switzerland Line S13 (Milan suburban railway service), Italy
Locomotives Sri Lanka Railways S13, a diesel multiple unit
Stations Iyo-Izushi Station, in Ōzu, Ehime Prefecture, Japan Mizuho Undōjō Nishi Station, in Mizuho-ku, Nagoya, Aichi Prefecture, Japan Otaru-Chikkō Station, in Otaru, Hokkaido, Japan Sōgō Undō Kōen Station, in Suma-ku, Kobe, Hyōgo Prefecture, Japan Sumiyoshi Station (Tokyo), in Kōtō, Tokyo, Japan
Roads S13 highway (Georgia) County Route S13 (California), United States
Science 40S ribosomal protein S13 British NVC community S13, a swamps and tall-herb fens community in the British National Vegetation Classification system S13: Keep away from food, drink and animal feedingstuffs, a safety phrase S13, a star orbiting Sagittarius A*
Vessels
, an armed yacht of the Royal Canadian Navy , a submarine of the Royal Navy
, a submarine of the United States Navy
Other uses S13 (classification), a disability swimming classification S-13 rocket, a Soviet air-to-ground rocket weapon Shayetet 13, a unit of the Israel Defense Forces S13, a postcode district in Sheffield, England