S13

• 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 Navy
• Shayetet 13, an Israel Defense Forces naval commando elite special forces unit
• Fokker S-13, a German dual-engine propeller aircraft used during World War II
• S-13 rocket, a 1970s 122mm calibre unguided Soviet rocket weapon
• HMS Osiris, an Oberon class submarine

• S13 (classification), a disability swimming classification used by the International Paralympic Committee

• S13 (Nissan Silvia), a generation of cars
• S13 postcode, covering areas of eastern Sheffield
• S13 (Rhine-Ruhr S-Bahn) railway line
• S13 (ZVV), a railway line of the S-Bahn Zürich in Switzerland
• County Route S13 (California), a road in the state of California

• RPS13, a ribosomal protein
• S/2004 S 13, a natural satellite of Saturn
• S13: Keep away from food, drink and animal feedingstuffs, a safety phrase in chemistry
• British NVC community S13, a swamps and tall-herb fens community in the British National Vegetation Classification system
• S13 (star), a star orbiting Sagittarius A*, the center of the Milky Way

S₁₃ may refer to :

• a cyclic allotrope of sulfur