| Abbreviation | Definition |
|---|---|
| OVERS | Orbital VEhicle Re-entry Simulator |
| OVF | OVerFill |
| OVFL | OVerFLow |
| OVG | On-demand Vortex Generator |
| OVHD | OVerHeaD |
| OVHT | OVerHeaT |
| OVI | Operational Validation Inspection |
| OVLD | OVerLoaD |
| OVRD | OVerRiDe |
| OVS | Operational Voice System |
| OVV | OVerVoltage |
| OW | Optical Window |
| OWC | Off World Colonies |
| OWD | One-Way Doppler |
| OWDE | One-Way Doppler Extraction |
| OWF | Optimum Working Frequency |
| OX | Oxidizer |
| OXD | OXiDe |
| OXD | Oxide, Oxidizer |
| OXDZR | Oxidizer |