| Abbreviation | Definition |
|---|---|
| ATD | Applied Thermo-Dynamics |
| ATE | Advanced Technology Education |
| ATEP | Aboriginal Teacher Education Program |
| ATI | Agricultural Technical Institute |
| ATL | American Thought And Language |
| ATL | Association Of Teachers And Lecturers |
| ATO | Agro Technologisch Onderzoek |
| ATOM | Accentuating Technical Opportunities For Minorities |
| ATRU | Auditorium Theatre of Roosevelt University |
| ATS | American Teaching System |
| ATS | Applicant Tracking System |
| ATSM | Athletic Training Sports Medicine |
| ATSO | Advanced Technology Student Organization |
| ATSO | Anatolia Turkish Student Organization |
| ATSU | A T Still University |
| ATSU | Accelerator Test Stand Upgrade |
| ATSU | AT Still University of Health Sciences |
| ATTO | Assistive Technology Training Online |
| ATU | American Top Universities |
| ATU | Aquatic Therapy University |