| Mrugavani National Park | Parque Nacional de Mrugavani |
| MS | maestro en ciencias |
| MS Explorer | MS Explorer |
| MS Freedom of the Seas | Freedom of the Seas |
| MS-DOS | MS-DOS |
| MS-DOS Editor | Edit |
| MSc | maestro en ciencias |
| MSISDN | Estación móvil de la Red Digital de Servicios Integrados |
| MSN | MSN |
| MSN Hotmail | Hotmail |
| MSN Messenger | MSN Messenger |
| MSN TV | WebTV |
| Msta River | Msta |
| Mstislav I of Kiev | Mstislav I de Kiev |
| Mstislav Rostropovich | Mstislav Rostropóvich |
| MSV Duisburg | MSV Duisburg |
| MSV-Arena | MSV-Arena |
| Mswati II of Swaziland | Mswati II de Swazilandia |
| Mswati III of Swaziland | Mswati III de Suazilandia |
| MSX | MSX |
| mt | cerro |
| Mtatsminda Pantheon | Panteón de Agripa |
| MtDNA‚ mitochondrial DNA | ADN mitocondrial |
| MTF | FTM |
| Mthatha | Umtata |
| MTK Hungária FC | MTK Hungária FC |
| MTR | MTR |
| MTS | MTS |
| Mtskheta | Miskheta |
| MTV | MTV |
| MTV Latin America | MTV Latinoamérica |
| MTV Movie Awards | MTV Movie Awards |
| MTV Networks Europe | MTV Europa |
| MTV Russia | MTV |
| MTV Russian Music Awards | MTV Russian Music Awards |
| MTV Thailand | MTV |
| MTV Unplugged | MTV Unplugged |
| MTV Unplugged in New York | MTV Unplugged in New York |
| MTV Video Music Awards | MTV Video Music Awards |
| Mu Arae | Mu Arae |
| Mu Draconis | Arrakis |
| Mu Geminorum | Tejat Posterior |
| Mu Leonis | Rasalas |
| Mu Lyrae | Mu Lyrae |
| Mu Online | Mu online |
| Mu Ursae Majoris | Tania Australis |
| Mu-recursive function | Función recursiva |
| MUA | Cliente de correo electrónico |
| Muammar al-Gaddafi | Muammar al-Gaddafi |
| Muan County | Condado de Muan |
| Muaskar | Muaskar |
| Muawiyah I | Muawiya ibn Abi Sufyan |
| Muay Thai | Muay thai |
| Muban | Muban |
| Muc | Múnich |
| Mucc | Mucc |
| much | bien |
| much as | por mucho que |
| Mucic acid | Ácido múcico |
| mucilage | mucílago |
| Mucius | Escévola |
| muck | manchar |
| muck out | sacar el estiércol de |
| muck up | manchar |
