| Acronym | Definition |
|---|
| AACS | American Association of Christian Schools |
| AACS | Advanced Access Content System (standard for content distribution and digital rights management) |
| AACS | American Academy of Cosmetic Surgery |
| AACS | Attitude and Articulation Control Subsystem |
| AACS | Alta Autoridade para a Comunicação Social (Portugal) |
| AACS | American Association of Cosmetology Schools |
| AACS | Airborne Air Control Squadron |
| AACS | Adult Advancement and Careers Service (UK) |
| AACS | Army Airways Communications System |
| AACS | American Academy of Clinical Sexologists |
| AACS | Automated Access Control System |
| AACS | Applied Aged Care Solutions (Victoria, Australia) |
| AACS | Attitude & Articulation Control Subsystem |
| AACS | Airborne Activity Confinement System |
| AACS | Airways & Air Communications Service |
| AACS | Airborne Astrographic Camera System |
| AACS | Automated Airspace Computer System |
| AACS | Asynchronous Address Communication Systems |
| AACS | Association for Arkansas Cave Studies, Inc. |
| AACS | Acquisition Advice Code System |
| AACS | Attitude and Antenna Control Subsystem |
| AACS | Automated Analog Circuit Synthesis |
| AACS | Armenian American Cultural Society |
| AACS | Ambient Air Control System |
| AACS | Auxiliary Attitude Control System |
| AACS | Associate of Australian Computer Society |
| AACS | Authentication and Access Control System |
| AACS | Anti Aircraft Control Station |
| AACS | Aircraft Approach Control System (receiver-decoder) |