S3

S3, S-3 or S03 may refer to:

Entertainment

 * Si3 (film), 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

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 class
 * 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
 * Junior Secondary Education Assessment, a standardized examination from 1981 to 1987