| Acronym | Meaning |
 | ACM | Many |
| ACMC | (U.S.) Assistant Commandant Of The Marine Corps |
| ACN | Airborne Communications Node - Australian Company Number (number Issued By The Australian Government As Registration Of A Limited Liability Company) |
| ACO | Airspace Control Order |
| ACOBA | Advisory Committee On Business Appointments |
| ACOG | American College Of Obstetricians And Gynecologists |
| ACOM | (U.S.) Atlantic Command |
| ACORN | Association Of Community Organizations For Reform Now |
| ACP | Air Control Point |
| ACR | Advanced Concepts And Requirements |
| ACRI | African Crisis Initiative |
| ACS | Affiliated Computer Services (NYSE ACS) - American Cancer Society - American Chemical Society - Association Of Caribbean States |
| ACSC | Army Command And Staff College (various Nations) |
| ACT | R -ACT-Rational (cognitive Model) |
| ACT | R/PM -ACT-R/Perceptual-Motor (cognitive Model) |
| ACT | Adaptive Control Of Thought (cognitive Model) ? Australian Capital Territory (postal Symbol) ? American College Test(ing Program) |
| ACTD | Advanced Concept Technology Demonstration |
| ACTF | Australian Children's Television Foundation - (U.S.) Army Constructive Training Federation |
| ACTU | Australian Council Of Trade Unions |
| ACUF | BGN Advisory Committee On Undersea Features |
| ACV | Armoured Combat Vehicle |
| AD | Air Defence -Andorra (ISO 3166 Digram) -Anno Domini (Latin |
| AD LOC. | Ad Locum (Latin |
| ADA | Air Defence Artillery - American Dental Association - Assistant District Attorney - Americans With Disabilities Act (see Also The Similar But Non-acronymic Ada Programming Language) |
| ADAGE | Air Defense Air To Ground Engagement (simulation) |
| ADAP | AIDS Drug Assistance Program |
| ADAS | Asiago-DLR Asteroid Survey |
| ADAT | Alesis Digital Audio Tape (recording Format) |
| ADATP | Automated Data Processing |
| ADATS | Agricultural Development And Training Society - Air Defence Anti-Tank System - Australian Defence Air Traffic System |
| ADB | Asian Development Bank |
| ADC | Aide De Camp - U.S. Air Defense Command (1946-1992) - Apple Display Connector - Program Against Digital Counterfeiting Of Currency |
| ADCTS | Advanced Distributed Combat Training System |
| ADD | Analog Digital Digital (CD Quality) - Attention-Deficit Disorder - Administration On Developmental Disabilities |
| ADDIE | Analyze Design Develop Implement And Evaluate |
| ADDNS | Advanced Deployable Day/Night Simulation |
| ADF | Australian Defence Force - African Development Foundation |
| ADHD | Attention-Deficit Hyperactivity Disorder |
| ADHS | Attention-Deficit Hyperactivity Syndrome |
| ADI | Acceptable/Allowable Daily Intake |
| ADIZ | Air Defence Identification Zone |
| ADL | Anti-Defamation League |
| ADM | Administrative -- Full Admiral (four Stars) In The U.S. Navy |
| ADOA | Air Defence Operations Area |
| ADP | Adenosine DiPhosphate - Army Doctrine Publication (UK |
| ADRG | Arc-second Raster Chart (ARC) Digitized Raster Graphics |
| ADS | Active Denial System - Astrophysics Data System - Attention Deficit Syndrome |
| ADT | Atlantic Daylight Time (UTC-3 Hours) |
| ADTB | Army Doctrine And Training Bulletin |
| ADV. | Adversus (Latin |
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