| Abbreviation | Definition |
|---|---|
| ABSS | Association of Bartenders & Sommeliers Singapore |
| ABT | Alliantie van Bier Tapperijen |
| ABTA | Association of British Travel Agents |
| ABTA | Australasian Business Travel Association |
| ABTS | American Board of Thoracic Surgery |
| ABU | American Board of Urology |
| ABU | Association of Banyan Users |
| ABVP | American Board of Veterinary Practitioners |
| ACA | American Chiropractic Association |
| ACAAI | American College of Allergy, Asthma and Immunology |
| ACAC | American Council for Accredited Certification |
| ACAOM | Accreditation Commission for Acupuncture and Oriental Medicine |
| ACAP | Academy of Clinical and Applied Psychoanalysis |
| ACAPS | American Council of Academic Plastic Surgeons |
| ACAS | Associate of Casualty Actuatial Society |
| ACASH | Association of Corporations and Apex Society of Handlooms |
| ACAU | ACA University, Affordable Care Act University |
| ACBS | Association for Contextual Behavioral Science |
| ACC | American College of Cardiology |
| ACCA | American College of Cardiovascular Administrators |