| Abbreviation | Definition |
|---|---|
| ABS | Applied Behavioral Science |
| ABS | Association of Bucknell Students |
| ABSC | Academic Board Standards Committee |
| ABSD | Applied Behavioural Sciences Department |
| ABSS | Adelaide Business Students' Society |
| ABSTR | Abstract |
| ABSU | Abia State University |
| ABSU | All Bodo Students Union |
| ABSUU | ABia State University, Uturu |
| ABU | Ahmadu Bello University |
| ABU | Ahmadu Bello University, Zaria |
| ABU | Alliance Biblique Universelle |
| ABU | Arlington Baptist University |
| ABU | Atlantic Baptist University |
| ABUEN | Asociacion de Bibliotecas Universitarias y Especializados de Nicaragua |
| ABUP | Association of British University Presses |
| ABVE | American Board of Vocational Experts |
| AC | Academic Community |
| AC | Advanced Credit |
| ACAC | Academic Computing Advisory Committee |