| Abbreviation | Definition |
|---|---|
| ABSP | American Board of School Psychology |
| ABSP | American Business School Paris |
| ABSS | Alamance Burlington School System |
| ABSS | Alamance-Burlington School System |
| ABSS | Alison Bixby Stone School |
| ACA | American Canyoneering Academy |
| ACBSP | Accreditation Council for Business Schools Programs |
| ACBSP | Association of Collegiate Business Schools and Programs |
| ACCEC | Association Canadienne des Commissaires d'écoles Catholiques (Canadian Catholic School Trustees' Association) |
| ACCS | Advisory Commission on Charter Schools |
| ACCSC | Accrediting Commission of Career Schools and Colleges |
| ACDC | Albuquerque Child Development Center |
| ACDS | Alexandria Country Day School |
| ACDS | Arlington Country Day School |
| ACDS | Aspen Country Day School |
| ACDS | Aylett Country Day School |
| ACHS | Abraham Clark High School |
| ACHS | Accelerated Charter High School |
| ACHS | Adams City High School |
| ACHS | Adolfo Camarillo High School |