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– * 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

Entertainment and media

* 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''

Language

* An, English indefinite article * Anglo-Norman language * Aragonese language (ISO 639-1:2002 language code AN) * Dutch language#Official status, 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")

Mathematics, science, and technology

* ''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. * Newton (unit), Attonewton (aN), an SI unit of force * Anorthite, a feldspar mineral

Military

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

Names

* Ahn (Korean name) (安) * An (surname) (安), Chinese surname

Places

* 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 (obsolete NATO country code AN) * Angola (World Meteorological Organization country code AN) * Netherlands Antilles (ISO country code AN)

Religion

* An (Shintō), a small table or platform used during Shinto ceremonies * Anu or An, a god in Sumerian and Babylonian mythology

Other uses

* Associate degree in nursing * Algebraic notation (chess) (AN), the standard system for recording moves in chess