| mask | ocultar |
| Mask of Agamemnon | Máscara de Agamenón |
| masked | enmascarado |
| masked ball | baile de máscaras |
| Masked Duck | Oxyura dominica |
| Masked hunter | Reduvius personatus |
| Masked Lapwing | Vanellus miles |
| Masked Lovebird | Agapornis personatus |
| masking tape | cinta adhesiva |
| Maslamah Ibn Ahmad al-Majriti | Maslama al-Mayriti |
| Maslenitsa | Carnaval |
| Maslow’s hierarchy of needs | Pirámide de Maslow |
| Masmo | Masmo |
| Masmuda | Masmuda |
| Maso di Banco | Maso di Banco |
| masochism | masoquismo |
| masochist | masoquista |
| masochistic | masoquista |
| Masolino da Panicale | Masolino da Panicale |
| mason | albañil |
| Mason-Dixon line | Línea Mason-Dixon |
| Mason-Weaver equation | Ecuación de Mason-Weaver |
| masonic | masónico |
| Masonic Landmarks | Masonería Regular |
| Masonic Lodge | Logia Masónica |
| masonry | albañilería |
| Masoretic Text | Masoreta |
| Masorti | Judaísmo conservador |
| Masovia | Mazovia |
| Masovian Blessed Virgin Mary Cathedral | Catedral |
| Masovian Voivodeship | Mazovia |
| masquerade | mascarada |
| mass | cantidad |
| mass communication | comunicación en masa |
| Mass concentration | Mascon |
| Mass conservation | Ley de conservación de la masa |
| Mass exchange | Intercambio de masas |
| Mass exodus | Éxodo |
| Mass flow | Flujo de masa |
| Mass flow rate | Gasto másico |
| Mass function | Función de masa |
| mass hysteria | histerismo colectivo |
| Mass in B Minor | Misa en si menor |
| Mass in C major | Misa en Do mayor |
| Mass in special relativity | Masa relativista |
| Mass loss | Pérdida de masa |
| mass media | medios de comunicación |
| Mass migration | Periodo de las grandes migraciones |
| mass movement | movimiento en masa |
| Mass number | Número másico |
| mass production | producción en serie |
| Mass radius relation | Relación masa-radio |
| Mass ratio | Relación de masas |
| mass recreation | actividades recreativas multitudinarias |
| Mass spectrometry | Espectrómetro de masa |
| Mass storage device | Memoria de gran capacidad |
| Mass transfer | Transferencia de masa |
| mass transport | transporte de masa |
| mass-produce | producir en serie |
| Massa | Massa |
| Massa language | Massa |
| Massachusett | Massachusett |
| Massachusetts | Massachusetts |
| Massachusetts General Hospital | Hospital General de Massachusetts |
| Massachusetts Institute of Technology | Instituto Tecnológico de Massachusetts |
| Massachusetts State House | Casa del Estado de Massachusetts |
| Massachusetts Supreme Judicial Court | Corte Suprema Judicial de Massachusetts |
| massacre | matanza |
| Massacre of the Innocents | Día de los Santos Inocentes |
| massage | masaje |
| Massagetae | Masageta |
| Massagno | Massagno |
| Massalfassar | Masalfasar |
| Massalia | Massalia |
| Massamagrell | Masamagrell |
| Massanassa | Masanasa |
| Massari | Massari |
| Massawa | Massawa |
| Masse moléculaire | Masa molecular |
| Massecuite | Diabetes mellitus |
| masseur | masajista |
| masseuse | masajista |
| massif | macizo |
| Massif Central | Macizo Central |
| Massimo Oddo | Massimo Oddo |
| Massiness | Gravedad |
| massive | imponente |
| Massive Attack | Massive Attack |
| Massive blackout in France | Europa estuvo al borde del colapso eléctrico por culpa del apagón |
| Massive earthquakes strike Indonesia | Terremotos mayores sacuden Indonesia |
| Massive galaxy | Galaxia masiva |
| Massive object | Objeto masivo |
| Massive retaliation | Doctrina Eisenhower |
| Massive star | Estrella masiva |
| Massively multiplayer online game | MMORPG |
| Massively multiplayer online role-playing game | MMORPG |
| Massongex | Massongex |
| Massonnens | Massonnens |
| Massospondylus | Massospondylus |
| mast | mástil |
| mastectomy | mastectomía |
| master | patrón |
