| Abbreviation | Definition |
|---|---|
| MPSS | Mission Planning and Scheduling System |
| MPSS | Multiple Payload Support Structure |
| MPST | Multi-Purpose Support Team |
| MPT | Main Propulsion Test |
| MPT | Mathematics/Physics/Technology Division |
| MPTA | Main Propulsion Test Article |
| MPTF | Main Propulsion Test Facility |
| MPTP | Main Propulsion Test Program |
| MPTS | Multi-Purpose Tool Set |
| MPVA | Main Propellant Valve Actuator |
| MQO | Mission Quality Operations |
| MQP | Mission Quality Profile |
| MQS | Mission Quality Statistics |
| MR | Main Ring |
| MR | Maintenance and Refurbishment |
| MR | Maintenance and Repair |
| MR | Master Reset |
| MR | Material Review |
| MR | Medium Rate |
| MR | Mirror Reflector |