| Abbreviation | Definition |
|---|---|
| MIR | Montgolfiere Infra-Rouge |
| MIRROR | Multi Image Reflection Refraction Object Rendering |
| MIS | Mission Information Subsystem |
| MISS | MISSion |
| MISSE | Materials International Space Station Experiment |
| MIST | Mars Impactor Science Trial |
| MIT | Massachusetts Institute of Technology |
| MIT | Massachusetts Institute of Technology (CSDL) |
| MIT | Master Instruction Tape |
| MITS | Marshall Integrated Telecommunications System |
| MITS | Micro Instrumentation and Telemetry System |
| MITTS | Mobile Igor Tracking Telescope System |
| MIU | MPE Interface Unit |
| MIU | Multiplex Interface Unit |
| MIUL | Materials Identification and Usage List |
| MIUS | Modular Integrated Utility Systems |
| MJ | Mass of Jupiter |
| MJ | Mechanical Joint |
| MJCA | Midbody Jettison Control Assembly |
| MJS | Manipulator Jettison System |