| Abbreviation | Definition |
|---|---|
| ACT | Canadian Association for Translation Studies |
| ACTFL | American Council on the Teaching of Foreign Languages |
| ACTIS | Aranui Community Trust Incorporated Society |
| ACTM | Australasian College of Tropical Medicine |
| ACU | Association of Clinicians for the Underserved |
| ACUBE | Association of College and University Biology Educators |
| ACWS | American Civil War Society |
| ADA | Australian Dental Association |
| ADAMS | All Dulles Area Muslim Society |
| ADC | Association Dentaire Canadienne |
| ADC | Canadian Dental Association |
| ADDS | A Domestic Discipline Society |
| ADF | Association Dentaire Franaise |
| ADF | Association Dentaire Française |
| ADF | French Dental Association |
| ADHS | Alcohol and Drugs History Society |
| AdK | Akademie der Knste |
| AdK | Akademie der Künste |
| ADPS | Alpha Delta Phi Society |
| ADRS | Australasian Double Reed Society |