| Abbreviation | Definition |
|---|---|
| ACRD | Alberni Clayoquot Regional District (British Columbia, Canada) |
| ACRP | Adolescent Crisis Response Program |
| ACRR | Association of Cities and Regions for Recycling |
| ACRS | Arkansas Consumer Report System |
| ACRTA | Allen County Regional Transit Authority |
| ACS | Administration for Children's Services |
| ACSA | Arizona Cyber Security Alliance |
| ACSEF | Aberdeen City and Shire Economic Future (UK) |
| ACSP | Arch??ology Customer Service Project (Ontario) |
| ACSP | Archæology Customer Service Project (Ontario) |
| ACSR | Advisory Council of State Representatives |
| ACT | Arts, Culture, and Trade |
| ACTF | Advocacy and Communication Task Force |
| ACVA | Alexandria Convention and Visitors Association |
| ACVB | Abilene Convention and Visitors Bureau |
| ACVB | Ames Convention and Visitors Bureau |
| ACVB | Anchorage Convention and Visitors Bureau |
| ACVB | Arlington Convention and Visitors Bureau |
| ACVB | Asheville Convention and Visitors Bureau |
| ACVB | Atlanta Convention and Visitors Bureau |