As

As, AS, A. S., A/S or similar may refer to:

Art, entertainment, and media

 * A. S. Byatt (born 1936), English critic, novelist, poet and short story writer
 * Adult Swim, a programming block on Cartoon Network
 * Akademiska Sångföreningen, an academic male voice choir of Helsinki, Finland
 * As (newspaper), a Spanish sports newspaper
 * "As" (song), by Stevie Wonder
 * As, a 1896 novel by Adolf Dygasiński
 * As the Dog, a sculpture in Warsaw, Poland

Business legal structures

 * Akciová společnost (a.s.), a Czech form of joint-stock company
 * Akciová spoločnosť (a.s.), a Slovak form of joint-stock company
 * Aktieselskab or A/S, a type of Danish stock-based company
 * Aksjeselskap or AS, a type of Norwegian stock-based company

Businesses and organizations

 * A.S. Roma, an Italian football club
 * Alaska Airlines, IATA airline designator
 * Armée secrète (Belgium), a World War II resistance organization
 * KK AS Basket, a Serbian basketball club
 * Armée secrète, a French resistance organization
 * Oakland Athletics, an American baseball team referred to as the A's
 * Australian Standards, a standards organisation established in 1922
 * Voiturettes Automobiles A.S., a French-based car manufacturer in 1920s
 * AS Type A2, a sports car manufactured by Voiturettes Automobiles A.S.
 * Towarzystwo Budowy Samochodów AS, a Poland-based car manufacturer in 1920s and 1930s
 * AS S1 and AS S2, a passenger car manufactured by Towarzystwo Budowy Samochodów AS

Education and research

 * Academia Sinica, the national academy of Taiwan
 * AS-level (disambiguation), any of several uses in education
 * Associate of Science, an American academic degree

Language

 * As language, a language of West Papua, Indonesia
 * as, ISO 639-1 code for the Assamese language of India
 * As (cuneiform), a written character
 * Aš (cuneiform), a written character

Computing

 * as (Unix), an assembler program
 * .as, the Internet country code top-level domain for American Samoa
 * ActionScript, for Flash and Flex applications
 * Autonomous system (Internet), a collection of IP networks
 * Application server, a computer running back-end applications
 * the type conversion operator, used in C# and Rust

Health and medicine

 * Angelman syndrome, a neuro-genetic disorder
 * Ankylosing spondylitis, a type of arthritis
 * Aortic stenosis, a valvular heart disease
 * Asparagine synthase (glutamine-hydrolysing), an enzyme
 * Asperger syndrome, an autism spectrum disorder
 * Auricular splint, a custom-made medical device used as part of ear surgery

Units of measurement

 * Arcsecond, $1/60$ arcminute, a unit of angular measurement
 * Attosecond or as, 10−18 second, a subunit of time
 * Attosiemens or aS, 10−18 siemens, a subunit of electric conductance

Other uses in mathematics and science

 * Abramowitz and Stegun, a mathematical reference work
 * Aggregate supply, in economics, the total supply of goods
 * Almost surely or a.s., in probability theory
 * Arsenic, symbol As, a chemical element
 * As (beetle), a genus in family Cerylonidae
 * Tropical savanna climate, labelled As or Aw

Europe

 * Aš, a town in the Czech Republic
 * Ås, Akershus, Norway
 * As, Belgium, in Limburg
 * Ås, Sør-Trøndelag, Norway
 * Ås, Swedish name for the Harju quarter in Helsinki, Finland

Other places

 * As-e Jadid (اس جديد, "New As"), a village in East Azerbaijan Province, Iran
 * As-e Qadim (اس قديم, "Old As"), a village in East Azerbaijan Province, Iran
 * American Samoa (ISO 3166 code AS)
 * .as, the Internet country code top-level domain for American Samoa
 * Australia (obsolete NATO and FIPS country codes AS)
 * Assam, a state of India

Religion

 * Æsir (singular: ás, áss, ǫ́ss), one of the pantheon of Norse gods
 * ʿAlayhi s-salām (عليه السلام), Arabic for "Peace be upon him", post-nominal posthumous Islamic honorific

Other uses

 * As (Roman coin), a coin and unit of weight
 * A.S., Anno Societatis, a calendrical system used in the Society for Creative Anachronism
 * Anti-submarine warfare, A/S
 * Old name for Ossetians, "As" or "Asi"
 * A US Navy hull classification symbol: Submarine tender (AS)
 * Altostratus, a cloud that is sometimes abbreviated as As.
 * AS, Indonesian abbreviation for United States