| Abbreviation | Definition |
|---|---|
| APO | Air Post Office |
| APO | Always Pure Organics |
| APO | Apache Peak Observatory |
| APO | Apache Point Observatory |
| APO | ARDEC Project Officer |
| APO | Ashbury Precision Ordnance |
| APO | Asian Productivity Organization |
| APO | Auckland Philharmonia Orchestra |
| APO | Audio Processing Object |
| APO | Audio Processing Objects |
| APO | Automatic Platform Optimizations |
| APOA | Asia Pacific Orthopaedic Association |
| APOA | Asia Pacific Orthopaedic Associations |
| APOBA | Associate Pipe Organ Builders of America |
| APOBS | Anti Personnel Obstacle Breaching |
| APOBS | Anti personnel obstacle breaching system |
| APOC | A Piece Of Cleveland |
| APOC | A Piece Of Cloth |
| APOC | Arcane Power on Critical |
| APOC | Assistant Production Office Coordinator |