S2

S2, S 2, S.2 or S-2 may refer to :

; beginning with "S2" :
* S2, a former Scottish television channel, owned by SMG plc
* S2 (Berlin), a S-Bahn line
* S2 (Dresden), a S-Bahn line
* S2 (Framingham), S2 Security Corp, a IP based security product manufacturer
* S2 Games, a programing company
* , a safety phrase in chemistry
* S-2 (military), an intelligence officer within military units
* S2 (Munich), a S-Bahn line
* S2 National Highway, a National Highways of Pakistan
* S2 postcode, covering areas of eastern Sheffield
* S2 programming language
* S2 Records, a subsidiary of Sony Music
* S2 (star), a star in the Galactic Center
* S-2 Tracker, a US Navy aircraft
* S2 Yachts, a Michigan, USA built sailboat (now defunct)

; containing "S2" :
* Alco S-2, a locomotive
* Audi S2, a turbo charged supercar
* British NVC community S2, a swamps and tall-herb fens community in the British National Vegetation Classification system
* Canon PowerShot S2 IS, a 2005 5.0 megapixel digital camera
* County Route S2 (California)
* FinePix S2 Pro, a 2002 interchangeable lens digital single-lens reflex camera by Fuji
* Finnish torpedo boat S2
* Focke-Wulf S 2, a 1928 German trainer aircraft
* Lotus Elise S2, the second and current production series
* Nikon Coolpix S2, a 5.4 million pixels digital camera
* Porsche 944 S2, a 3l naturally aspirated sportcar (mf.1989-1991)
* PRR S2, a unique steam turbine locomotive
* Prussian S 2, a 1884 steam locomotives class
* S/2007 S 2, a natural satellite of Saturn
* SABCA S-2, a 1926 Belgian aircraft
* Short S.2, a
* USS S-2 (SS-106), a US Navy submarine

; designation or shortening for :
* Bangladesh aircraft registration code
* JetLite IATA airline designator
* sacral spinal nerve 2, a spinal nerve of the sacral segment
* Schedule 2, an Australian legal category assigned to drugs
* 'Season 2' of a television program
* second sacral vertebra
* second year in the Scottish education system
* 'semester 2' in a highschool student cursus
* Starcraft 2
* a version of the racing simulation Live for Speed
* [http://www.nuwiki.com/cgi-bin/nuwiki.cgi?display=STEPHANIE%20SAILOR Stephanie Sailor] , a agent of Innovation
* a heart on chat rooms and on-line games (also seen as "<3")
* a designation for Göta signalregemente, a 1944-1997 Swedish Army signal regiment
* a planned Bremen S-Bahn line
* a Hamburg S-Bahn line
* a Hanover S-Bahn line
* a Nuremberg S-Bahn line
* a RheinNeckar S-Bahn line
* a Rhein-Ruhr S-Bahn line
* a Rhine-Main S-Bahn line
* a Rostock S-Bahn line
* a Stuttgart S-Bahn line
* a Zürich S-Bahn line
* a Stadtbahn Karlsruhe line

S₂ may refer to :
* S₂, a sound in cardiac auscultation
* disulfur, an allotrope of sulfur

"'S² may refer to :
* S² Engine, the "SuperSolenoid engine" of Neon Genesis Evangelion

S02 may refer to :
* ATC code S02, a section of the Anatomical Therapeutic Chemical Classification System
* HMS Rorqual (S02), a 1956 British Royal Navy Porpoise-class submarine