| Abbreviation | Definition |
|---|---|
| ATBQ | Association des Tourneurs sur Bois du Québec. |
| ATBU | Association of Theravada Buddhist Universities |
| ATCA | Air Traffic Control Association |
| ATCA | All Tripura Chess Association |
| ATCA | American Theatre Critics Association |
| ATCA | Antique Telephone Collectors Association |
| ATCA | Association of Turkish Cypriots Abroad |
| ATCM | Association of Town and City Management |
| ATCO | Association of Transport Coordinating Officers |
| ATCSA | Association of Thoracic and Cardiovascular Surgeons of Asia |
| ATDA | American Train Dispatchers Association |
| ATDF | Association des Tunisiens de France |
| ATDL | Association Temps Danse Libre |
| ATE | Association of Tanzania Employers |
| ATEA | Australian Teacher Education Association |
| ATEE | Association for Teacher Education in Europe |
| ATEE | Association of Teacher Education in Europe |
| ATEE | Association Technique Energie Environnement |
| ATEE | Association Technique Energy Environment |
| ATER | Association of Theaters in Emilia Romagna |