| Abbreviation | Definition |
|---|---|
| ARL | Aquatic Research |
| ARL | Arizona Research Laboratories |
| ARLI | Action Research Leaiership Institute |
| ARLO | Acoustics Research Letters Online |
| ARMD | Aeronautics Research Mission Directorate |
| ARMIS | Agricultural Research Management Information System |
| ARMR | American Registry for Migraine Research |
| ARN | Access Research Network |
| ARN | Accounting Research Network |
| ARNA | Action Research Network of the Americas |
| ARO | Accelerated Research Opportunities |
| ARO | Alpine Research Optics |
| ARO | Analytics Research Organization |
| ARO | Animal Research |
| ARO | Animal Research Online |
| ARO | Association for Research in Otolaryngology |
| ARO | Atmospheric Research Observatory |
| AROS | Amiga Research Oprating System |
| AROS | AROS Research Operating System |
| AROS | Research Operating System |