| Abbreviation | Definition |
|---|---|
| MGA | Middle Gimbal Angle |
| MGC | Manual Gain Control |
| MGE | Maintenance Ground Equipment |
| MGE | Media Generation Element |
| MGIB | Montgomery G I Bill |
| MGS | Mars Global Surveyor |
| MGSE | Mechanical Ground Support Equipment |
| MGT | Major Ground Test |
| MGVT | Mated Ground Vibration Test |
| MHA | Multiple Headset Adapter |
| MHC | Manipulator Hand Controller |
| MHD | Multi-Head Disc |
| MHE | Material Handling Equipment |
| MHF | Medium High Frequency |
| MHSA | Mars Horizon Sensor Assembly |
| MHSC | Manipulator Hand-Set Controller |
| MHW | Multi-Hundred Watt |
| MI | Management Information |
| MI | Mode Indicator |
| MIA | Mission Implementation Agreement |