| AACS | acetoacetyl CoA synthetase 
| Others |
| AACS | Active Aero Control System
| Others |
| AACS | Advanced Access Content System
| Others |
| AACS | Advanced Access Content Systems
| Others |
| AACS | Advanced Automotive Consulting Services
| Others |
| AACS | Afsaneh Art and Culture Society
| Others |
| AACS | Airborne Alternate Control Station
| Others |
| AACS | Airways and Air Communications Service
| Others |
| AACS | Alfred Almond Central School
| Others |
| AACS | American Academy of Cosmetic Surgeons
| Others |
| AACS | American Academy of Cosmetic Surgery
| Others |
| AACS | American Association for Chinese Studies
| Others |
| AACS | American Association of Christian Schools
| Others |
| AACS | American Association of Cosmetology Schools
| Others |
| AACS | Ann Arbor Computer Society
| Others |
| AACS | Annapolis Area Christian School
| Others |
| AACS | Annual Admin Code Supplement
| Others |
| AACS | Argentine Association of Soil Science
| Others |
| AACS | Army Airway Communications Service
| Others |
| AACS | Army Airways Communications System
| Others |
| AACS | Asbestos Abatement Contractors Supervisors
| Others |
| AACS | Asbestos Abatement Contractors/Supervisors training class
| Others |
| AACS | Ashtabula Area City Schools
| Others |
| AACS | Asian American Community Services
| Others |
| AACS | Association for Applied and Clinical Sociology
| Others |
| AACS | Attendance Allowance Computer System
| Others |
| AACS | Attitude and Articulation Control Subsystem
| Others |
| AACS | Attitude and Articulation Control Subsystems
| Others |
| AACS | Australasian Association of Convenience Stores
| Others |
| AACS | Automated Access Control System
| Others |