| Abbreviation | Definition |
|---|---|
| OMCF | Orbiter Maintenance and Checkout Facility |
| OMD | Operations and Maintenance Documentation |
| OMD | Orbiter Mating Device |
| OMDP | Orbiter Maintenance Depot |
| OMDP | Orbiter Maintenance Down Period |
| OMDP&P | Operations Maintenance Documentation Planning and Production |
| OMDR | Operations and Maintainability Data Record |
| OMDR | Operations and Maintenance Data Record |
| OMDR1 | Operations and Maintainability Data Record |
| OME | Orbital Maneuvering Engine |
| OME | Orbiter Main Engine |
| OME | Orion Main Engine |
| OMET | Orbiter Mission Elapsed Time |
| OMEWG | Orbiter Maintenance Engineering Working Group |
| OMI | Operations and Maintenance Instruction |
| OMI | Operations And Maintenance Instructions |
| OMI | Ozone Monitoring Instrument |
| OMIS | Operational Management Information System |
| OMISS | Operation and Maintenance Instruction Summary Sheet |
| OMISS | Operation and Maintenance Instruction Summary Sheet(s) |