| Acronym | Definition |
|---|
| AN | As Needed |
| AN | Author's Note |
| AN | Associated Number |
| AN | Army/Navy |
| AN | Army Navy (hydraulic or pneumatic fitting used in the aerospace industry) |
| AN | Associate Nurse |
| AN | Arrival Notice (shipping) |
| AN | Army Nurse Corps |
| AN | Atomic Number |
| AN | Netherlands Antilles (top-level domain name) |
| AN | Ascending Node |
| AN | Army Nomenclature |
| AN | Aryan Nations |
| AN | Administrators' Noticeboard (Wikimedia Foundation) |
| AN | Aragonese (ISO 639-1 language code) |
| AN | Auftragnehmer (German: contractor) |
| AN | Anime Nation (anime website and forum) |
| AN | Anime North |
| AN | Archives Nationales du Canada (National Archives of Canada) |
| AN | Assemblé Nationale (French Parliament) |
| AN | Alsace Nature |
| AN | Akademija Nauk (Academy of Sciences; Russia) |
| AN | Airworthiness Notice |
| AN | Avian Nephritis |
| AN | Ahmadi Nezhad (Iran) |
| AN | AstroNest (company) |
| AN | Alternating Network |
| AN | Aldo Nero (Spanish, shoes and leather good maker) |
| AN | Army Interoperability Network |
| AN | Acronym Namespace (humor) |
| AN | analog nonsecure (US DoD) |
| An | Actinon (Actinium emanation) |
| AN | American Nightmare (band) |
| AN | Anglais (French: English) |
| AN | Airborne Network |
| AN | Arabian Nights |
| AN | Account Name |
| AN | Analog |
| AN | Account Number |
| AN | Access Number |
| AN | Annum (Latin: Year) |
| AN | Ancona (Marche, Italy) |
| AN | Apocalypse Now (movie) |
| AN | Ambient Noise |
| AN | Andorra |
| AN | Anorexia Nervosa |
| AN | Antonov (Soviet aircraft designer) |
| AN | Aniridia |
| AN | Access Node |
| AN | Airman |
| AN | Alleanza Nazionale (Italian: National Alliance, right-wing political party) |
| AN | Alphanumeric |
| AN | Access Network |
| AN | Ahonen (blood group) |
| AN | Allied Nations (Street Fighter game) |
| AN | Ammonium Nitrate |
| AN | Ansett Australia Airlines (flight number prefix) |
| AN | Acanthosis Nigricans (skin disorder) |
| AN | Alianza Nacional (National Alliance, Guatemala) |
| AN | Advisory Note |
| AN | Acoustic Neuroma |
| AN | Acrylonitrile |
| AN | Arquivo Nacional (Portuguese: National Archives; Brazil) |