S13

S13, S.XIII, S-13 or S 13 can mean :
* , a safety phrase in chemistry
* S13 (Nissan Silvia), a generation of cars
* S13 postcode, covering areas of eastern Sheffield
* S-13 rocket, a 1970s 122 mm calibre unguided Soviet rocket weapon
* British NVC community S13, a swamps and tall-herb fens community in the British National Vegetation Classification system
* County Route S13 (California), a road in the state of California
* Fokker S-13, a WWII dual engine propellor aircraft
* RPS13, a ribosomal protein
* S/2004 S 13, a natural satellite of Saturn
* SPAD S.XIII, a French biplane fighter aircraft of World War I
* Soviet submarine S-13, a 1939 Stalinets-class submarine of the Soviet Navy
* USS S-13 (SS-118),a 1921 S-class submarine of the United States Navyand also a shortening or designation for :
* HMS Osiris, an Oberon class submarine
* Shayetet 13, an Israel Defense Forces naval commando elite special forces unit
* a Rhein-Ruhr S-Bahn line
* a Zürich S-Bahn line

S₁₃ may refer to :
* a cyclic allotrope of sulfur