| Abbreviation | Definition |
|---|---|
| AOS | associated office systems |
| AOS | Atmospheric and Oceanic Sciences |
| AOS | Audience Operating System |
| AOS | Audio Overhaul for Skyrim |
| AOS | Automated Office Systems |
| AOS | The American Orchid Society |
| AOSA | American Orff Schulwerk Association |
| AOSA | Architecture of Open Source Applications |
| AOSA | Art of Sustainable Action |
| AOSA | Association of Official Seed Analysts |
| AOSB | Advanced Oriented Strand Board |
| AOSB | American Orchid Society Bulletin |
| AOSB | Android Open Source BAM |
| AOSB | Any Other Standard Breed |
| AOSB | Arctic Ocean Sciences Board |
| AOSC | Airsoft Organization of South Carolina |
| AOSC | Alabama Office of the State Climatologist |
| AOSC | Area of Scholarly Concentration |
| AOSD | Accounting Operations Systems Division |
| AOSD | Advanced Optical System Demonstration |