| Asilomar Conference on Circuits, Systems, and Computers | Academic & Science |
| Colombian Association of Scientific Societies | Academic & Science |
| Asociación Colombiana de Sociedades Científicas | Academic & Science |
| Advanced Casino Systems Corporation | Business |
| Allen County Schools Cooperative | Community |
| Auburn Christian Student Center | Community |
| Association Of Carolina Shag Clubs | Community |
| Alabama Christian Sports Conference | Community |
| Association of Centers for the Study of Congress | Community |
| Aptos Cabrillo Swim Club | Community |
| Avon Community School Corporation | Community |
| Anderson Community School Corporation | Community |
| Alameda Community Sailing Center | Community |
| Ateneo Corporate Sustainability Conference | Community |
| Advanced Cyber Security Center | Computing |
| Australian Cyber Security Centre | Computing |
| Administrative Computing Steering Committee | Computing |
| Army Computer Systems Command | Computing |
| Austria Cyber Security Challenge | Computing |
| Alabama Controlled Substances Certificate | Educational Degree |
| Area of Critical State Concern | General |
| Air Conditioning System Controller | General |
| Always Comes Second to Ceder | General |
| Automobile Club of Southern California | General |
| Ambulatory Care Sensitive Conditions | Medical |
| Air Command and Staff College | Military and Defence |
| Australian Computer Science Conference | Regional |
| Australia Commonwealth Specialist Catalogue | Regional |
| Atmos Cities Steering Committee | Regional |
| Australian Command and Staff College | Regional |
| Asheville City Soccer Club | Sports |
| Alabaster Competitive Soccer Club | Sports |
