| Abbreviation | Definition |
|---|---|
| OMNG | Organizational Maintenance National Guard |
| OMNI | Oppose Military and Neutralize Invasion |
| OMNR | Operations and Maintenance, Navy Reserve |
| OMO | Orderly Medical Officer |
| OMP | Operational Mission Profile |
| OMPF | Official Military Personnel File |
| OMPR | Official Military Personnel Record |
| OMRSD | Operations and Maintenance Requirements and Specification Documentation |
| OMS | Office of Mission Support |
| OMS | Operational Mode Summary |
| OMS/MP | Operational Mode Summary/Mission Profile |
| OMSC | Overseas Military Sales Corporation |
| OMSN | Oregon Military Support Network |
| OMSP | Office of Military and Security Programs |
| OMT | Operations Management Team |
| OMT | Orthogonal Mode Transducer |
| OMT/OMTP | Operational Maintenance Test(Ing)/test Plan |
| OMVS | Office of Military and Veteran Services |
| OMW | Ocean Monitoring Workstation |
| OMW | Operational Mine Warfare |