| Abbreviation | Definition |
|---|---|
| ASTHO | Association of State and Territorial Health Officers |
| ASTM | American Society for Testing and Materials |
| ASTP | Arfa Software Technology Park |
| ASTS | American Society of Transplant Surgeons |
| ASTW | Australian Society of Travel Writers |
| ASVA | Association of Summer Villages of Alberta |
| ASWA | AASHA Social Welfare Association |
| ASWB | Association of Social Work Boards |
| ASWM | Association of State Wetland Managers |
| ATA | American Translators Association |
| ATA | American Trucking Associations |
| ATA | Archery Trade Association |
| ATA | Association Of Translation Agencies |
| ATAC | Air Transport Association of Canada |
| ATC | Advanced Technology Consortium |
| ATE | Association of Teacher Educators |
| ATF | Albuquerque Teachers' Federation |
| ATG | Artists Television Group |
| ATI | Association Of Technical Incompetence |
| ATIA | Assistive Technology Industry Association |