| Abbreviation | Definition |
|---|---|
| ARLANDRIA | Arlington/ Alexandria, Virginia |
| ARMP | Abalone Recovery and Management Plan |
| ARO | Affordable Requirements Ordinance |
| ASAGA | Alaska State Association For Guardianship And Advocacy |
| ASBC | American Standard Building Code |
| ASDSO | Association of State Dam Safety Officials |
| ASI | Advanced Secure Issuance |
| ASLD | Arizona State Land Department |
| ASO | Assistant Section Officer |
| ASP | Alandur Sewerage Project |
| ASRS | Arizona State Retirement System |
| ASYR | Addiction Services for York Region |
| ATAP | Alabama Telecommunications Access Program |
| ATC | Authorization to Carry |
| ATC | Average Total Cost |
| ATEF | Alabama Therapeutic Education Facility |
| ATIF | Arizona Technology Investor Forum |
| ATOP | Access to Opportunities Program (Ontario) |
| ATSI | Aboriginal Torres Strait Islander |
| AUB | Athens Utilities Board |