AN

An, AN, aN, or an may refer to:

Businesses and organizations

Airlinair (IATA airline code AN)
Alleanza Nazionale, a former political party in Italy
AnimeNEXT, an annual anime convention located in New Jersey
Anime North, a Canadian anime convention
Ansett Australia, a major Australian airline group that is now defunct (IATA designator AN)
Apalachicola Northern Railroad (reporting mark AN) 1903–2002
- AN Railway, a successor company, 2002–present^[update]
Aryan Nations, a white supremacist religious organization
Australian National Railways Commission, an Australian rail operator from 1975 until 1987
Antonov, a Ukrainian (formerly Soviet) aircraft manufacturing and services company, as a model prefix

Antv, an Indonesian television network
Astronomische Nachrichten, or Astronomical Notes, an international astronomy journal
Avisa Nordland, a Norwegian newspaper
Sweet Bean (あん), a 2015 Japanese film also known as An

An, English indefinite article
Anglo-Norman language
Aragonese language (ISO 639-1:2002 language code AN)
Algemeen Nederlands (meaning "Common Dutch"), the official Dutch language
A variant of the prefix "in", used before vowels to convey the meaning "not" (for example: aneuploid means "not euploid")

A_n, in mathematics, a root system and its Dynkin diagram
A_n, in mathematics, conventional notation for the alternating group
a_n, a generic label for a term of a sequence
AN thread, Army and Navy thread - for bolts and tube fittings in 16th inch increments
Acanthosis nigricans, a skin condition
Acrylonitrile, an organic compound and monomer used in the manufacture of certain plastics
Actinide (An), informal symbol for a series of chemical elements
Ammonium nitrate (AN), a chemical compound
Anode, in electronic schematics
Anorexia nervosa, an eating disorder
Application note (in engineering), most often seen as A.N.
Attonewton (aN), an SI unit of force
Anorthite, a feldspar mineral
Adobe Animate, an Adobe animation software

A prefix used by the U.S. military for electronic equipment named under the Joint Electronics Type Designation System
A US Navy hull classification symbol: Net laying ship (AN)
Avtomat Nikonova used for the AN-94

An County, in Sichuan, China
Agios Nikolaos (disambiguation), a common place name in Greece and Cyprus
Province of Ancona, a province of Italy (ISO 3166-2:IT code AN)
Andaman and Nicobar Islands, a territory in southeastern India (ISO 3166 code AN)
Anderson County, Kansas (state county code AN)
Andorra (FIPS, LOC MARC and obsolete NATO country code AN)
Angola (World Meteorological Organization country code AN)
Netherlands Antilles (ISO country code AN)

Associate degree in nursing
Algebraic notation (chess) (AN^{[citation needed]}), the standard system for recording moves in chess