| Abbreviation | Definition |
|---|---|
| AATA | American Art Therapy Association |
| AATA | American Association of Teachers of Arabic |
| AATA | AZ Automobile Theft Authority |
| AATCC | American Association of Textile Chemists and Colorists |
| AATP | American Association for Technology in Psychiatry |
| AATP | American Association of Teachers of Persian |
| AATS | American Academy of Teachers of Singing |
| AATS | American Association for Thoracic Surgery |
| AAUPTC | American Association of University Psychology Training Centers |
| AAVLD | American Association of Veterinary Laboratory Diagnosticians |
| AAVMC | Association of American Veterinary Medical Colleges |
| AAVSO | American Association of Variable Star Observers |
| AAWP | American Association for Women Podiatrists |
| AAWU | Association of Accredited Wykamol Users |
| ABA | American Bar Association |
| ABA | American Board of Anesthesiology |
| ABA | American Boatbuilders Association |
| ABA | American Booksellers Association |
| ABA | American Bus Association |
| ABA | Australian Biotechnology Association |