| Abbreviation | Definition |
|---|---|
| ATA | Arizona Tennis Association |
| ATA | Asia Theological Association |
| ATA | Association of Talent Agents |
| ATA | Atlantic Treaty Association |
| ATAA | Assembly of Turkish American Associations |
| ATAA | Australian Technical Analysts Association |
| ATAA | Avon and Tributaries Angling Association |
| ATAD | Association for Teen Age Diplomats |
| ATALA | Australian Travel Association for Latin America |
| ATAM | Association for Textile and Apparel Management |
| ATAO | Art Therapy Association of Oklahoma |
| ATAP | Association of Talent Acquisition Professionals |
| ATAP | Association of Tax Accounting Professionals |
| ATAP | Association of Threat Assessment Professionals |
| ATAS | Association of Top Achiever Scouts |
| ATBA | All Terrain Boarding Association |
| ATBA | American Tending Breeds Association |
| ATBA | Arizona Thoroughbred Breeders Association |
| ATBA | Arizona Transportation Builders Association |
| ATBA | Authorized Training Body Association |