| Acronym | Meaning |
 | ASD(S&R) | (U.S.) Assistant Secretary Of Defense (Strategy & Requirements)) |
| ASD(S&TR) | (U.S.) Assistant Secretary Of Defense (Strategy & Threat Reduction) |
| ASD(SO&HA) | (U.S.) Assistant Secretary Of Defense (Special Operations & Humanitarian Assistance) |
| ASD(SO/LIC) | (U.S.) (Special Operations & Low-Intensity Conflict) |
| ASDIC | Allied Submarine Detection Investigation Committee (Sonar) |
| ASDR | Attack |
| ASEAN | Association Of South East Asian Nations |
| ASFAR | Americans For A Society Free Of Age Restrictions |
| ASG | Area Support Group |
| ASIC | Aviation Security Identification Card |
| ASICS | Anima Sana In Corpore Sano (Latin |
| ASIO | Australian Security Intelligence Organisation -Audio Stream Input Output |
| ASIP | Advanced System Improvement Program - Army Stationing And Installation Plan - Application Specific Instruction-Set Processor |
| ASL | Above Sea Level - American Sign Language (also Known As Ameslan) - Age |
| ASM | Air-to-Surface Missile -American Samoa (ISO 3166 Trigram) -American Society For Metals -American Society For Microbiology |
| ASM | Assamese Language (ISO 639-2 Code) |
| ASMB | Adult Swim Message Board |
| ASMB | American Society For Matrix Biology |
| ASMP | Air-Sol Moyenne Port?e Missile (French Medium-range Air To Surface) -Asymmetric Multiprocessing |
| ASN | Associate Of Science In Nursing |
| ASOC | Air Sovereignty Operations Centre - Air Support Operations Centre - Airport Security And Operations Centre - Antarctic And Southern Ocean Coalition - Atlanta Symphony Orchestra Chorus - Australian Standard Offence Classification |
| ASP | Active Server Pages - American Society Of Primatologists - Ammunition Supply Point - Application Service Provider (cf Internet Service Provider) - Astronomical Society Of The Pacific - Association Of Surfing Professionals |
| ASPI | Australian Strategic Policy Institute |
| ASR | Anti Slip Regulation |
| ASRAAM | Advanced Short-Range Air-to-Air Missile |
| ASSC | Association For The Scientific Study Of Consciousness |
| AST | Atlantic Standard Time (UTC-4 Hours) |
| ASTIA | Armed Services Technical Information Agency |
| ASTM | American Society For Testing And Materials |
| ASTREA | Aerial Support To Regional Enforcement Agencies (sheriff's Air Support Unit) |
| ASUW | AntiSUrface Warfare |
| ASW | AntiSubmarine Warfare |
| ASWORG | (U.S.) AntiSubmarine Warfare Operations Research Group |
| ASX | Advanced Stream Redirector - Australian Stock Exchange |
| AT | Anti-Tank -Ashmore And Cartier Islands (FIPS 10-4 Territory Code) - Austria (ISO 3166 Digram) -Advanced Technology (IBM Personal Computer/AT) |
| AT | Astatine |
| AT | Attotesla |
| AT&T | American Telephone And Telegraph (U.S. Company |
| ATA | Advanced Technology Attachment (IBM Personal Computer) - Afghan Transitional Authority - Allen Telescope Array -Antarctica (ISO 3166 Trigram) |
| ATAC | Air Transportable Acoustic Communications |
| ATACMS | Army TACtical Missile System |
| ATAPI | Advanced Technology Attachment Packet Interface |
| ATAS | Air-To-Air Stinger (missile) |
| ATB | Active Time Battle -British Antarctic Territory (ISO 3166 Trigram; Merged With AQ In 1979) |
| ATC | Air Traffic Control - Air Training Corps - U.S. Air Transport Command (1942-1948) |
| ATCCIS | Army Tactical Command And Control Information System |
| ATESS | Aerospace And Telecommunications Engineering Support Squadron |
| ATF | French Southern Territories (ISO 3166 Trigram) -Bureau Of Alcohol |
| ATFU | Ate The Fuck Up - Related To FUBAR |
| ATG | Antigua And Barbuda (ISO 3166 Trigram) |
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