| Abbreviation | Definition |
|---|---|
| ABYA | Anchor Bay Yachting Association |
| ABYA | Association of Brokers and Yacht Agents |
| ABYA | Association of Brokers Yacht Agents |
| ACA | Afro Caribbean Association |
| ACA | Amazon Conservation Association |
| ACA | American Cable Association |
| ACA | American Camping Association |
| ACA | American Canyoneering Association |
| ACA | American Coatings Association |
| ACA | American Communication Association |
| ACA | American Compliance Association |
| ACA | American Correctional Association |
| ACA | American Counseling Association |
| ACA | American Cryptogram Association |
| ACA | American Crystallographic Association |
| ACA | Angel Capital Association |
| ACA | Appalachian College Association |
| ACA | Arms Control Association |
| ACA | Australian Cricketers Association |
| ACA | Avid Customer Association |