| Acronym | Meaning |
 | ATGM | Anti-Tank Guided Missile |
| ATGW | Anti-Tank Guided Weapon |
| ATI | Allied Telesyn International |
| ATK | Attack |
| ATL | Atlanta |
| ATLAS | All-Terrain Lifter Army System -Assessment Tool For LAnd Systems |
| ATM | Automated Teller Machine - Asynchronous Transfer Mode - At The Moment |
| ATN | Dronning Maud Land (ISO 3166 Trigram; Merged With AQ In 1983) |
| ATO | Air Tasking Order - Australian Taxation Office |
| ATP | Adenosine TriPhosphate - Allied Tactical Publication - Ammunition Transfer Point |
| ATSD | (U.S.) Assistant To The Secretary Of Defense |
| ATSDR | Agency For Toxic Substances And Disease Registry |
| ATV | All-Terrain Vehicle |
| ATWA | Air |
| AU | African Union (was OAU Before 2000) - American University -Astronomical Unit - Australia (ISO 3166 Digram) - Austria (FIPS 10-4 Country Code) |
| AU | Gold |
| AUC | Ab Urbe Condita / Anno Urbis Conditae (Latin From The Founding Of The City / In The Year Since The Founding Of The City) (of Rome) - Area Under The Curve (concentration Time Curve; Medicine) |
| AUD | Australian Dollar (ISO 4217 Currency Code) |
| AUS | Australia (ISO 3166 Trigram) |
| AUSCANZUKUS | Australia |
| AUT | Austria (ISO 3166 Trigram) |
| AUTL | Army Universal Task List |
| AV | Anguilla (FIPS 10-4 Territory Code) -Audio-Visual -Aviation |
| AV | Attovolt |
| AV | Avar Language (ISO 639-1 Code) |
| AVA | Avar Language (ISO 639-2 Code) |
| AVCATT | A -(U.S. Army's) Aviation Combed Arms Tactical Trainer-Aviation [Reconfigurable Manned Simulator] |
| AVDLR | Aviation Depot Level Repair |
| AVE | Avestan Language (ISO 639-2 Code) |
| AVGP | Armoured Vehicle |
| AVI | Audio Video Icon |
| AVIM | Aviation Intermediate Maintenance |
| AVLB | Armoured Vehicle Launched Body--65.41.49.50 21:40 |
| AVO | Apprehended Violence Order |
| AVP | Arubaanse Volkspartij |
| AVP | Association Of Volleyball Professionals |
| AVRE | Armoured Vehicle Royal Engineers |
| AVTB | Armoured Vehicle Test Bed -Aviation Test Bed |
| AVUM | Aviation Unit Maintenanc |
| AW | Aruba (ISO 3166 Digram) |
| AW | Attowatt |
| AWA | American Wrestling Association |
| AWACS | Airborne Warning And Control System |
| AWC | Air Warfare Centre |
| AWD | Many |
| AWE | Advanced Warfighting Experiment |
| AWG | Aruban Guilder (ISO 4217 Currency Code) |
| AWOL | Absent Without Official Leave / Absent WithOut Leave (military Jargon) |
| AWP | Awaiting Parts (SM&R Code) |
| AWSIM | Air Warfare SIMulation |
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