| ACPA | Aboriginal Centre for the Performing Arts 
| Others |
| ACPA | Activated Carbon Producers Association
| Others |
| ACPA | Air Canada Pilots Association
| Others |
| ACPA | Allegheny County Port Authority
| Others |
| ACPA | American Catholic Philosophical Association
| Others |
| ACPA | American Chronic Pain Association
| Others |
| ACPA | American Cleft Palate Association
| Others |
| ACPA | American College of Physician Advisors
| Others |
| ACPA | American College Personnel Association
| Others |
| ACPA | American Concrete Pavement Association
| Others |
| ACPA | American Concrete Pipe Association
| Others |
| ACPA | American Concrete Pumping Association
| Others |
| ACPA | American Crop Protection Association
| Others |
| ACPA | Amerischools College Preperatory Academy
| Others |
| ACPA | Anti Citrullinated Protein Antibody
| Others |
| ACPA | Anti-Citrullinated Protein Antibody
| Others |
| ACPA | Anti-cybersquatting Consumer Protection Act
| Others |
| ACPA | Anticybersquatting Consumer Protection Act
| Others |
| ACPA | Arab Certified Public Accountant
| Others |
| ACPA | Arizona Crime Prevention Association
| Others |
| ACPA | Armenian College and Philanthropic Academy
| Others |
| ACPA | Associate of the Association of Certified Public Accountants (International)
| Others |
| ACPA | Associate of the Institute of Certified Public Accountants in Ireland
| Others |
| ACPA | Association of Canadian Port Authorities
| Others |
| ACPA | Association of Celebrity Personal Assistants
| Others |
| ACPA | Association of Certified Public Accountants
| Others |
| ACPA | Association of Computer Programmers and Analysts
| Others |
| ACPA | Audio Capture and Playback Adapter
| Others |
| ACPA | Australian Community Pharmacy Authority
| Others |
| ACPA | Automovil Club Principado de Asturias
| Others |