| Abbreviation | Definition |
|---|---|
| ATOSS | Alternative To Out of School Suspension |
| ATS | Automate The Schools |
| ATSS | Abbotsford Traditional Secondary School |
| AUBM | Auburn Mountainview Schools |
| AUS | American United School |
| AUSD | Alameda Unified School District |
| AUSD | Albany Unified School District |
| AUSD | Alhambra Unified School District |
| AUSD | Anaheim unified school district |
| AUSD | Antioch Unified School District |
| AUSD | Arcadia Unified School District |
| AUSD | Atascadero Unified School District |
| AUSD | Azusa Unified School District |
| AUSL | Academy for Urban School Leadership |
| AUT | Alternating Unassigned Time |
| AVA | Academy of Vocal Arts |
| AVCS | Alta Vista Charter School |
| AVCS | AuSable Valley Central School |
| AVHS | Amador Valley High School |
| AVHS | Anderson Valley High School |