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