| Acronym | Meaning |
 | MR | ATGW -Medium-Range Anti-Tank Guided Weapon |
| MR | Marathi Language (ISO 639-1 Code) |
| MR | Mauritania (FIPS 10-4 Country Code; ISO 3166 Digram) |
| MRAV | Multi-Role Armoured Vehicle |
| MRBM | Medium Range Ballistic Missile |
| MRC | Maintenance Requirements Card |
| MRD | Motorized Rifle Division |
| MRE | Meal Ready To Eat (U.S. Military Rations) |
| MRGW | Medium-Range Guided Weapon |
| MRI | Magnetic Resonance Imaging |
| MRI | M?ori Language (ISO 639-2 Code) |
| MRL | Multiple Rocket Launcher |
| MRO | Maintenance |
| MRR | Maximum Rock And Roll - Minimum-Risk Route - My Restaurant Rules |
| MRS | Magnetic Resonance Spectroscopy |
| MRSA | Methicillin-resistant Staphylococcus Aureus |
| MRT | Mauritania (ISO 3166 Trigram) |
| MRTFB | U.S. Major Range And Test Facility Base |
| MS | Mano Sinistra (Latin |
| MS | Malay Language (ISO 639-1 Code) - Millisecond |
| MS | Megasecond |
| MS | Millisiemens |
| MSA | Malay Language (ISO 639-2 Code) |
| MSB | Main Support Battalion - Most Significant Bit (or Byte) |
| MSD | Minimum Safe Distance |
| MSDB | Multi Source Data Base |
| MSDE | Maryland State Department Of Education -Microsoft Data[base] Engine - Microsoft SQL Server 2000 Desktop Engine -Military Scenario Development Environment - Mission Simulation Dynamic Engine |
| MSDL | Military Scenario Definition Language |
| MSE | Multiple Subscriber Element |
| MSEC | Message Security Encryption Code (emm-sec) |
| MSG | MonoSodium Glutamate |
| MSH | Medium Support Helicopter - Mount Saint Helens |
| MSI | Micro-Star International -Multispectral Imagery |
| MSIE | Microsoft Internet Explorer - Master Of Science In Industrial Engineering |
| MSL | Mars Science Laboratory - Mean Sea Level -Missile |
| MSLP | Mean Sea Level Pressure |
| MSM | Mount St Mary's School |
| MSN | Master Of Science In Nursing |
| MSO | Multiple System Operator |
| MSR | Main Supply Route - Module Service Record -Montserrat (ISO 3166 Trigram) -Motor Schlepp Regulung |
| MSSA | Methicillin-susceptible Staphylococcus Aureus |
| MST | Madison Symmetric Torus - Mountain Standard Time (UTC-7 Hours) |
| MST3K OR MST3K | Mystery Science Theater 3000 |
| MT | Malta (FIPS 10-4 Country Code; ISO 3166 Digram) - Megatesla - Montana (postal Symbol) -Motor Transport (military) |
| MT | Maltese Language (ISO 639-1 Code) |
| MT | Meitnerium |
| MT | Millitesla |
| MTBF | Mean Time Between Failures |
| MTF | Medical Treatment Facility - Message Text Format |
| MTG | Magic: The Gathering |
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