AN
- an – (s) Aragonese language (ISO 639-1 code)
- aN – (s) Attonewton
- AN
- (s) Andorra (FIPS 10-4 country code)
- Netherlands Antilles (ISO 3166 digram)
- ANA
- (i) Administration for Native Americans
- Afghan National Army
- All Nippon Airways
- Anti-Nuclear Anti-body
- (a) Australian National Airways
- Australian Natives Association
- ANC – (i) African National Congress
- AND – (s) Andorra (ISO 3166 trigram)
- ANFO – (i) Ammonium nitrate/fuel oil (explosive)
- ANG
- (i) Air National Guard
- (s) Angola (IOC and FIFA trigram, but not ISO 3166)
- (s) Netherlands Antillian guilder (ISO 4217 currency code)
- ANGLiCo – (p) Air/Naval Gunfire Liaison Company
- ANL – (i) Argonne National Laboratory
- ANM – (i) Acoustic Noise Monitor
- ANOVA – (p) ANalysis Of VAriance
- ANS – (i) Applied and Natural Sciences
- ANSI – (a) American National Standards Institute
- ANTM – (i) America's Next Top Model
- ANT
- (s) Netherlands Antilles (ISO 3166 trigram)
- Antigua and Barbuda (IOC trigram, but not ISO 3166 or FIFA)
- ANTY - Acronyms, No Thank You
- ANWR – (i) Arctic National Wildlife Refuge /ˈænwɑr/
- ANZ – (s) Australia and New Zealand Banking Group
- ANZAC – (a) Australian and New Zealand Army Corps
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