| Abbreviation | Definition |
|---|---|
| ARHS | Archbishop Riordan High School |
| ARHS | Ashley Ridge High School |
| ARHS | Auburn Riverside High School |
| ARISU | Assessment and Research Integration for School Use |
| AROS | Alliance to Reclaim Our Schools |
| ARPS | Amherst Regional Public Schools |
| ARSA | Arizona Rural Schools Association |
| ASA | Arizona School for the Arts |
| ASAA | Alberta Schools Athletic Association |
| ASAC | After School Activities Clubs |
| ASAC | After School Arts Club |
| ASAC | Association of School Aid in Cambodia |
| ASAM | Alternative Schools Accountability Model |
| ASAM | Australian School of Advanced Medicine |
| ASAP | Accelerated School Administrator Program |
| ASAP | After School Activities Partnerships |
| ASAP | After School Art Program |
| ASAP | After School Arts Program |
| ASAS | After School All Stars |
| ASAS | All Saints Anglican School |