| Acronym | Definition |
|---|
| ATSA | Association for the Treatment of Sexual Abusers |
| ATSA | Aviation and Transportation Security Act of 2001 (USA) |
| ATSA | American Translation Studies Association (now ATISA) |
| ATSA | Automated Timber Sale Accounting |
| ATSA | American Tactical Shooting Association |
| ATSA | Assembly of Turkish Student Associations |
| ATSA | Advanced Tactical Support Aircraft |
| ATSA | Aircraft Technical Support Association |
| ATSA | Aero Tech Service Associates, Inc. |
| ATSA | Advanced Tactical SIGINT Architecture |
| ATSA | Air Traffic System Analysis |
| ATSA | Access to Space Agents (NASA) |
| ATSA | Antipodal Tapered-Slot Antenna |