| Abbreviation | Definition |
|---|---|
| MMS | Master of Management Studies |
| MMS | Multi-mission Modular Spacecraft |
| MMS | Maintenance Monitoring System |
| MMSc | Master of Medical Sciences |
| MMT | Million Metric Tonnes |
| MMT | Multiple Mirror Telescope |
| MMTC | Minerals and Metals Trading Corporation |
| MMTC | Minerals and Metals Trading Corporation |
| MMTR | Madras Metropolitan Tumor Registry |
| MMU | Memory Management Unit |
| MMU | Manned Maneuvering Unit |
| MMW | Marshbird Monitoring Workshop |
| MN | Manganese |
| MN | Median Nerve |
| MNA | Master of NAvigation |
| MNA | Maximum Noise Area |
| MNA | Medical Nurse Associate |
| MNAMS | Member of the National Academy of Medical Sciences |
| MNAP | Mixed Nerve Action Potential |
| MNC | Multi National Company |
| MNC | Multinational Corporation |
| MNCV | Median Nerve Conduction Velocity |
| MNet | Mobile Internet |
| MNF | Mizo National Front |
| MNFI | Modified Net Farm Income |
| MNO | Manganese Oxide |
| MNP | Mobile Number Portability |
| MNPS | Minimum Navigation Performance Specification |
| MNPSA | Minimum Navigation Performance Specifications Airspace |
| MNR | Marine Nature Reserve |
| MNRAS | Monthly Notices Of The Royal Astronomical Society |
| MNS | Master of Natural Science |
| MO | Money Order |
| MO | Medical Officer |
| mo | month |
| MO | Money Order; Medical Officer |
| MO | Molybdenum |
| MO | Magneto - Optic |
| MO | Maintenance Operator |
| MO | Master Of Osteopathy |
| MOA | Medical Office Administrator |
| MOA | Memorandum of Agreement |
| MOA | Military Operations Area |
| MOABS | Monoclonal Antibodies |
| MOC | Master of Computergaming |
| MOC | Master Of Ceremonies |
| MOC | Mars Observer Camera |
| MOC | Meridional Overturning Circulation |
| MOCA | Minimum Obstruction Clearance Altitude |
| MOCVD | Metal Organic Chemical Vapor Deposition |