| Abbreviation | Definition |
|---|---|
| OPFOR | Opposing Forces |
| OPFOR | Opposition Force |
| OPG | Operations Planners Group |
| OPG | Operations Planning Group |
| OPGEN | Operation General Matter |
| OPI | Officer of Principal Interest |
| OPI | Oral Presentation Initiative |
| OPINS | Officer Personnel Information System |
| OPK | Ocean Peace Keeping |
| OPLAN | Operation Plan |
| OPLAW | Operational Law |
| OPLD | Occupational and Professional Licensing Division |
| OPM | Office of the Program Manager |
| OPM | Operational Procedues Manual |
| OPM | Operations Per Minute |
| OPME | Officer Professional Military Education |
| OPMG | Office of The Provost Marshal General |
| OPMS | Officer Personnel Management System |
| opn | operation |
| OPN | Operations |