| Abbreviation | Definition |
|---|---|
| APHI | American Political History Institute |
| APHI | Animal Population Health Institute |
| API | American Petroleum Institute |
| APIB | Asia Pacific Institute of Business |
| APIC | Asia-Pacific Institute of Creativity |
| APIF | Asia Pacific Institute of Finance |
| APIM | Asia Pacific Institute of Management |
| APIMS | Annals of Pakistan Institute of Medical Sciences |
| APIR | Asia Pacific Institute of Research |
| APLI | Assistant Principal Leadership Institute |
| APMI | Asia Pacific Management Institute |
| APPI | Alberta Professional Planners Institute |
| APPI | American Public Philosophy Institute |
| APPI | Austrailian Physiotherapy Pilates Institute |
| APPI | Australian Physiotherapy and Pilates Institute |
| APPI | Australian Physiotherapy Pilates Institute |
| APRI | A Philip Randolph Institute |
| APRI | Applied Policy Research Institute |
| APRI | Austrian Polar Research Institute |
| APSI | Advance Placement Summer Institute |