| AAC | Airborne Aircraft Controller |
|---|---|
| AAN | Airborne Aircraft Controller |
| ABS | Automatic Brightness Stabilization controller (skr.) |
| AC | Animal Collective, experimentálna hudobná skupina |
| AC | Atlantic College |
| ACR | American College of Radiology |
| ACT | American College Test |
| ACTS | Abroll-Container-Transport-System, systém kombinovanej dopravy v oblasti železnica-cesta |
| ADC | Air Direction Controller |
| ADC | Automated Data Collection |