| Abbreviation | Definition |
|---|---|
| ABR | American Board of Radiology |
| ABR | American Brittany Rescue |
| ABRF | Academy of Business Research Fund |
| ABRS | Area-Based Return Support |
| ABS | American Bible Society |
| ABS | American Biophysical Society |
| ABS | American Board of Surgery |
| ABS | American Boxwood Society |
| ABS | Aurora Beach Society |
| ABSA | American Biological Safety Association |
| ABSC | American Basic Science Club |
| ABSC | Arkansas Baptist State Convention |
| ABTA | American Brain Tumor Association |
| ABTR | Alabama Boston Terrier Rescue |
| ABTS | American Board of Thoracic Surgery |
| ABU | American Board of Urology |
| ABVP | Akhil Bharat Vidyarthi Parishad |
| ABVT | Ananda Buddha Vihara Trust |
| ABWF | A Better Way Foundation |
| ABWF | A Better World Fund |