| Abbreviation | Definition |
|---|---|
| AOH | Actual Operating Hours |
| AOI | Absence Of Ink |
| AOS | Academic Operating System |
| AOS | Audio Operating System |
| AOW | Asian and Oceanic Workshop for open systems |
| AP | Artificial Paradise |
| AP | Automation Protocol |
| APA | All Points Addressable |
| APA | Arithmetic Processing Accelerator |
| APC | Application Pointer Cache |
| APC | Australian Personal Computer |
| APD | Automatic Power Down |
| APE | Archives Portfolios Environment |
| APEC | All Purpose Electronic Computer |
| APF | Auxiliary Page Field |
| APGP | Air Portable General Purpose |
| APGST | Andhra Pradesh General Sales Tax |
| APIA | API Association |
| APIS | Adaptive Programmable Interface Unit |
| APM | Application Page Module |