| Abbreviation | Definition |
|---|---|
| OOTD | Order Of The Dragon |
| OOTW | Operations Other Than War |
| OOV | Organic Offboard Vehicle |
| OOW | Officer Of the Watch |
| OOW | Ohio Ordnance Works |
| OOZ | Typo for 00Z; MOS for Command Sergeant Major |
| OP | Observation Post |
| OP | Off-base Privileges |
| OP | Office of Protector |
| OP | Operating Plan |
| OP | Operational Publication |
| OP | Operations |
| OP | Opportunity Profile |
| OP | Ordnance Publication |
| OP | Overall Position |
| OPA | Other Procurement Authority |
| OPALS | Officer Projection Aggregate Level System |
| OPARS | Operational Planning, Analysis, and Review Staff |
| OPBAT | Operation Bahamas, Turks, and Caicos |
| OPBW | Organization for the Prohibition of Biological Weapons |