| Acronym | Meaning |
 | AFV | Armoured Fighting Vehicle |
| AFWA | Air Force Weather Agency - Association Of Fish And Wildlife Agencies |
| AFYA | Anything To Fool Young Andy. Acronym That's Real Meaning Is Hidden. |
| AG | Aktiengesellschaft (German |
| AG | Attogram |
| AG | Silver (Latin Argentum) |
| AGA | AB Gas-accumulator (ah-gah |
| AGARD | Advisory Group For Aerospace Research And Development |
| AGARDOGRAPH | Advanced Guidance For Alliance Research And Development Publication |
| AGASA | Akeno Giant Air Shower Array (cosmic Ray Detector) |
| AGB | Internal Nintendo Initialism (Advanced Game Boy) For Game Boy Advance |
| AGC | Adjutant General's Corps (British Army) |
| AGC | Apollo Guidance Computer - Automatic Gain Control |
| AGDC | Australian Game Developers' Conference |
| AGI | Auxiliary Group Intelligence |
| AGL | Above Ground Level |
| AGM | Annual General Meeting |
| AGN | Active Galactic Nucleus |
| AGO | Angola (ISO 3166 Trigram) |
| AGP | Accelerated Graphics Port |
| AGS | Alaska Ground Station (LandSat) |
| AGTS | Advanced Gunnery Training System |
| AGU | American Geophysical Union |
| AGW | Autonomous Guided Weapon |
| AH | Attack Helicopter |
| AH | Ampere-hour |
| AH | Attohenry |
| AHA | American Heart Association |
| AHCPR | Agency For Health Care Policy And Research (obsolete; Replaced With AHRQ) |
| AHEC | Australian Health Ethics Committee |
| AHPCRC | Army High Performance Computing Research Center |
| AHRQ | Agency For Healthcare Research And Quality |
| AHS | American Housing Survey |
| AI | Air Interdiction -Anguilla (ISO 3166 Digram) -Amnesty International - Artificial Insemination - Artificial Intelligence |
| AIA | Aerospace Industry Association - American Institute Of Architects -Anguilla (ISO 3166 Trigram) |
| AIAA | American Institute Of Aeronautics And Astronautics |
| AIC | African Independent Church |
| AICMFP | And I Claim My Five Pounds |
| AID | U.S. Agency For International Development |
| AIDS | Acquired Immune Deficiency Syndrome |
| AIM | Many |
| AIMP | Aurora Incremental Modernization Project |
| AIPAC | American Israel Public Affairs Committee |
| AIR | Aircraft Inventory Record |
| AIRFA | American Indian Religious Freedom Act |
| AIRS | Aerometric Information Retrieval System (obsolete; Replaced With AFS) |
| AISB | (British Society For The Study Of) Artificial Intelligence And The Simulation Of Behaviour |
| AJ | Attojoule |
| AJ | Azerbaijan (FIPS 10-4 Country Code) |
| AJAX | Asynchronous JavaScript And XML |
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