| Abbreviation | Definition |
|---|---|
| OWM | Ostomy Wound Management |
| OWO | One Way Out |
| OWR | Original Weapon Renewal |
| OWS | Operational Weather Squadron |
| OWS | Overhead Weapon Station |
| OWSS | Optimized Weapon System Support |
| OXG | Flight Gear Oxygen Mask |
| OY | Option Year |
| OY | Out Year |
| OYC | Out Year Costs |
| OYW | One Year War |
| OZ | Objective Zero |
| OZ | Operational Zone |
| OZ | Ounce |
| OZI | Oscar Zulu Infantry, Australia |
| P | Parallel Pattern |
| P | Physical |
| P | Plan |
| P | Position |
| P | Preparation |