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
Mathematics, science and technology
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
as, 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
Places
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