| Abbreviation | Definition |
|---|---|
| ACNA | Antiques Collectibles National Association |
| ACNA | Audubon Circle Neighborhood Association |
| ACNL | Association of California Nurse Leaders |
| ACOC | Association of Comilla Old Cadets |
| ACOE | Association of Chief Operating Engineers |
| ACOG | Association of Central Oklahoma Governments |
| ACOM | Association for Convention Operations Management |
| ACOP | Association of Chief Officers of Probation |
| ACORN | Association of Community Organizers for Reform Now |
| ACP | Association of Child Psychotherapists |
| ACP | Association of Contingency Planners |
| ACP | Association of Continuity Professionals |
| ACPA | Air Canada Pilots Association |
| ACPA | American Cleft Palate Association |
| ACPA | American College Personnel Association |
| ACPA | American Concrete Pumping Association |
| ACPA | Arizona Crime Prevention Association |
| ACPA | Association of Celebrity Personal Assistants |
| ACPA | Association of Certified Public Accountants |
| ACPAA | All China Patent Attorneys Association |