| Armenian College and Philanthropic Academy | Academic & Science |
| American Crop Protection Association | Academic & Science |
| American Catholic Philosophical Association | Academic & Science |
| American College of Physician Advisors | Academic & Science |
| Associate of The Institute of Certified Public Accountants In Ireland | Accounts and Finance |
| Associate of The Association of Certified Public Accountants (international) | Accounts and Finance |
| American Concrete Pipe Association | Business |
| Association of Canadian Port Authorities | Business |
| Activated Carbon Producers Association | Business |
| American Concrete Pavement Association | Business |
| Association of Certified Public Accountants | Community |
| Air Canada Pilots Association | Community |
| American Chronic Pain Association | Community |
| Amerischools College Preperatory Academy | Community |
| Arizona Crime Prevention Association | Community |
| Association of Celebrity Personal Assistants | Community |
| American Concrete Pumping Association | Community |
| American Cleft Palate Association | Community |
| Aboriginal Centre for the Performing Arts | Community |
| Association of Computer Programmers and Analysts | Computing |
| Audio Capture and Playback Adapter | Computing |
| American College Personnel Association | Educational Institute |
| Automovil Club Principado de Asturias | General |
| Anti-cybersquatting Consumer Protection Act | Internet |
| Arab Certified Public Accountant | Jobs |
| Anti-Citrullinated Protein Antibody | Medical |
| Australian Community Pharmacy Authority | Regional |
| Allegheny County Port Authority | Regional |
