| Abbreviation | Definition |
|---|---|
| ACA | American Cable Association |
| ACA | American Camping Association |
| ACA | American Canyoneering Association |
| ACA | American Citizens Abroad |
| ACA | American Coatings Association |
| ACA | American Communication Association |
| ACA | American Correctional Association |
| ACA | American Counseling Association |
| ACA | American Country Awards |
| ACA | American Cryptogram Association |
| ACA | American Crystallographic Association |
| ACA | Angel Capital Association |
| ACA | Applications of Computer Algebra |
| ACA | Arms Control Association |
| ACA | Asian Communication Awards |
| ACA | Awfully Clever Accountant |
| ACAA | Air Carrier Access Act |
| ACAA | Air Carriers Access Act |
| ACAA | Arizona Conservatory for Arts Academics |
| ACAA | Arizona Conservatory for Arts and Academics |