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S3, S-3 or S03 may refer to:

Entertainment

* ''Si3'' (flim), originally titled ''S III'' and also known as ''Singam 3'', the third film in the ''Singam'' franchise
* ''Expedition to the Barrier Peaks'', code S3, a 1980 ''Dungeons & Dragons'' adventure module
* S3 Plan, a fictitious program in the '' Metal Gear Solid 2: Sons of Liberty'' video game
*SABC 3, South African public television channel, stylised as S3

Transportation

Airlines

* Ashland Municipal Airport, FAA Location identifier S03, in Oregon, US
* SBA Airlines, IATA code S3, based in Caracas, Venezuela

Locomotives

* ALCO S-3, an American diesel switching (shunting) locomotive; see ALCO S-1 and S-3
* NER Class S3, a North Eastern Railway steam locomotive
* Prussian S 3, a steam locomotive

Rail lines

* S3 (Berlin), an S-Bahn line
* S3 (Munich), an S-Bahn line in Bavaria, Germany
* S3 (Nuremberg), an S-Bahn line in Bavaria, Germany
* S3 (RER Vaud), an S-Bahn line in Switzerland
* S3 (Rhine-Main S-Bahn), an S-Bahn line in Frankfurt Rhine-Main, Germany
* S3 (Rhine-Ruhr S-Bahn), an S-Bahn line in North Rhine-Westphalia, Germany
* S3 (St. Gallen S-Bahn), an S-Bahn line in Switzerland
* S3 (ZVV), a line of the S-Bahn Zürich in Switzerland
* Line S3 (Milan suburban railway service), an Italian commuter rail route
* S3, a Dresden S-Bahn line
* S3, a Hamburg S-Bahn line
* S3, a Hanover S-Bahn line
* S3, a Rhein-Neckar S-Bahn line
* S3, a Rostock S-Bahn line
* S3, a Stuttgart S-Bahn line
* S3, a S-Bahn Steiermark line

Cars

* Audi S3, a version of the Audi A3 small family car
* Bentley S3, a four-door luxury car produced by Bentley from late 1962 until 1965
* Luxgen S3, a sedan produced by Taiwanese-based manufacturer Luxgen starting from 2016
* S3 Roadster, a car produced by South African-based manufacturer Birkin Cars

Roads

* S3 Shanghai–Fengxian Highway, a planned expressway in Shanghai, China
* S-3 Strategic Highway, operated by the Pakistan Ministry of Defence; see National Highways of Pakistan (even though it is not actually a National Highway)
* Expressway S3 (Poland), a major road in Poland
* California County Route S3, from State Route 78 to Borrego Springs over the Yaqui Pass; see California county routes in zone S

Others

* Stagecoach Gold bus route S3, a bus route in Oxfordshire, England
* AJS S3 V-twin, a British motorcycle

Organizations

* Swiss Space Systems (S-3), an aerospace company in Switzerland
* S3 Safe Sex Store, an assumed name of Michigan corporation BAK
* SThree, a British recruitment agency

Military

* S3 (missile), a French nuclear missile now out of commission
* Lockheed S-3 Viking, an American anti-submarine aircraft developed in the 1970s
* S.3 Springbok, a British aerial reconnaissance aircraft of the 1920s; see Short Springbok
* USS ''S-3'' (SS-107), a U.S. Navy submarine
* Norrland Signal Battalion, designation S 3, a Swedish signal unit
* S3, the operations officer in military units; see Staff (military)

Science and technology

* Trisulfur, chemical formula (S₃), an allotrope of sulfur
* S-phrase 3, also referred to as S3, "Keep in a cool place", a safety phrase in chemistry; see List of S-phrases
* British NVC community S3, ''Carex paniculata swamp''; see Swamps and tall-herb fens in the British National Vegetation Classification system

Computing

* S3 Graphics, a computer-hardware company
* S3 Group, an Irish software company
* S3 Texture Compression, a group of lossy texture compression algorithms
* Amazon S3, also known as Amazon Simple Storage Service, an online data-storage service
* S3 (programming language), a language used to write the VME operating system and much other system software on the ICL 2900 Series
* S3, a standby mode in the Advanced Configuration and Power Interface (ACPI) specification
* Snapdragon S3, a Qualcomm ARM system-on-a-chip; see List of Qualcomm Snapdragon systems-on-chip

Electronics

* Canon PowerShot S3 IS, a 2006 digital camera; see Canon PowerShot S
* FinePix S3 Pro, a 2004 interchangeable lens digital single-lens reflex camera by Fujifilm
* Infinix Hot S3, a smartphone released in 2018
* Nikon S3, a 1953 35 mm film camera
* Nikon Coolpix S3, a digital camera
* Samsung Galaxy S III, or Samsung Galaxy S3, a smartphone: the successor to the Samsung Galaxy S II
** Samsung Galaxy S III Mini, or Samsung Galaxy S3 Mini, the mini version of the Samsung Galaxy S III
* Samsung Galaxy Tab S3, an Android tablet
* Samsung Gear S3, a 2016 smartwatch
* Samsung YP-S3, often referred to as the Samsung S3, an MP3 Player
* Siemens S3, a Siemens Mobile phone

Mathematics

* S₃, the symmetric group of degree 3; see Dihedral group of order 6
* S³, the 3-sphere (a 3-manifold in four-dimensional space)

Medicine and anatomy

* Sacral spinal nerve 3, a spinal nerve of the sacral segment
* Third heart sound, or S₃, a rare extra heart sound
* ATC code S03, ''Ophthalmological and otological preparations'', a subgroup of the Anatomical Therapeutic Chemical Classification System

Other uses

* S3 Asia MBA, a selective dual-degree, tri-city, tri-university global MBA program
* S3 (classification), a classification for swimmers based on their level of disability
* Form S-3, a registration form used by the U.S. Securities and Exchange Commission
* Postcode district S3, part of the S postcode area of the UK, covering part of Sheffield
* Third year, also known as S3, Scottish secondary education for pupils aged about 14

See also

* 3S (disambiguation)
* Schedule 3 (disambiguation)

{{Letter-Number Combination Disambiguation