| AACR | African Armed Conflicts Resolved 
| Others |
| AACR | All America Cables and Radio
| Others |
| AACR | American Association for Cancer Research
| Others |
| AACR | American Association of Cancer Research
| Others |
| AACR | American Authority of Central Rights
| Others |
| AACR | Amicale Anglo Cabriolet de Rennes
| Others |
| AACR | Anglo American Cataloging Rules
| Others |
| AACR | Anglo American Cataloguing Rules
| Others |
| AACR | Anglo-American Cataloguing Rules
| Others |
| AACR | Animal Assisted Crisis Response
| Others |
| AACR | Animal-Assisted Crisis Response
| Others |
| AACR | Arizona Association for Conflict Resolution
| Others |
| AACR | Association for the Advancement of Civil Rights
| Others |
| AACR | Association of Americans for Civic Responsibility
| Others |
| AACR | Australasian Association of Cancer Registries
| Others |
| AACR | Automated Analysis of Constructed Response
| Others |