| Abbreviation | Definition |
|---|---|
| OGV | Oxygen Gage Valve |
| OH | Overhaul |
| OH | Overhead |
| OHA | Operational Hazard Analysis |
| OHA | Orbital Height Adjustment maneuver |
| OHC | Onboard Hard Copier |
| OHC | Optics Hand Controller |
| OHF | Occupational Health Facility |
| OHGVT | Orbiter Horizontal Ground Vibration Test |
| OHMM | OHMMeter |
| OHP | Agency Occupational Health Program |
| OI | Operational Instrumentation |
| OI | Operations Interface |
| OI | Orbiter Insertion |
| OI | Orbiter Instrumentation |
| OIA | Orbiter Interface Adapter |
| OIB | Orbiter Interface Box |
| OIC | Orbiter Integrated Checkout |
| OIL | Operations Integration Instruction |
| OIR | Operations Integration Review |