| Acronym | Meaning |
 | AMSU | Association For Managers In Students' Unions - Aviation Mat?riel Screening Unit |
| AMTE | UK Admiralty Marine Technology Establishment (1977?1984) |
| AN | Andorra (FIPS 10-4 Country Code) - Netherland Antilles (ISO 3166 Digram) |
| AN | Aragonese Language (ISO 639-1 Code) |
| AN | Attonewton |
| ANA | Administration For Native Americans - Afghan National Army - All Nippon Airways - Anti-Nuclear Anti-body |
| ANC | African National Congress |
| AND | Andorra (ISO 3166 Trigram) |
| ANG | Air National Guard -Netherlands Antillian Guilder (ISO 4217 Currency Code) |
| ANGLICO | Air/Naval Gunfire Liaison Company |
| ANL | Argonne National Laboratory |
| ANM | Acoustic Noise Monitor |
| ANOVA | ANalysis Of VAriance |
| ANS | Applied And Natural Sciences |
| ANSI | American National Standards Institute |
| ANT | Netherland Antilles (ISO 3166 Trigram) |
| ANTM | America's Next Top Model |
| ANZAC | Australian And New Zealand Army Corps |
| AO | Angola (FIPS 10-4 Country Code; ISO 3166 Digram) -Approach Officer (submarine) - Area Of Operations |
| AOA | Argonne National Laboratory -Angolan Kwanza (ISO 4217 Currency Code) -Award Of Arms (heraldry) |
| AOC | Air Operations Centre |
| AOI | Angle Of IncidenceArab Organization For Industrialization |
| AOL | America OnLine |
| AOR | Area Of Responsibility |
| AOSTH | Adventures Of Sonic The Hedgehog |
| AOU | American Ornithologists' Union |
| AP | Advanced Placement - Air Publication -Armed Forces Pacific (postal Symbol) -Associated Press - Auto Pilot |
| APA | (i) American Psychiatric Association |
| APB | All Points Bulletin (police Jargon) |
| APC | Armoured Personnel Carrier - Armour Piercing Capped (ammunition) |
| APCNR | Armour-Piercing |
| APCR | Armour-Piercing |
| APDS | Armour-Piercing |
| APEDS | AMSAA Performance Estimates Data System |
| APFSDS | Armour-Piercing |
| APHA | American Public Health Association |
| APHE | Armour-Piercing |
| APHIS | Animal And Plant Health Inspection Service |
| API | Application Programming Interface |
| APL | A Programming Language - Acute Promyeloid Leukaemia - Anti-Personnel Landmine - Applied Physics Laboratory (Johns Hopkins University) |
| APM | Advanced Power Management |
| APOD | Aerial Port (Airport) Of Debarkation |
| APOE | Aerial Port (Airport) Of Embarkation |
| APOLLO | Apache Point Observatory Lunar Laser-ranging Operation |
| APP | Allied Procedural Publication |
| APR | Annual Percentage Rate |
| APS | American Physical Society - Antiphospholipid Antibody Syndrome |
| AQ | American Samoa (FIPS 10-4 Territory Code) - Antarctica (ISO 3166 Digram) |
| AR | Arabic Language (ISO 639-1 Code) |
| AR | Argentina (FIPS 10-4 Country Code; ISO 3166 Digram) - Arkansas (postal Symbol) - Armour |
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