| maser | maser |
| Maser di acqua | Water maser |
| Maser inversi | Inverse maser |
| Maser OH | OH masers |
| Maser SIO | SIO maser |
| Maserati | Maserati |
| Maseru | Maseru |
| Masfjorden | Masfjorden |
| Mash-up | Mashup |
| Mashhad | Mashhad |
| mashie | mashie |
| Mashrek | Mashriq |
| Masi Oka | Masi Oka |
| Masiakasaurus | Masiakasaurus |
| Masjid al-Haram | Masjid al-Haram |
| Masku | Masku |
| Maslama ibn Abd al-Malik | Maslamah ibn Abd al-Malik |
| masnada | gang |
| masnadiere | brigand |
| Maso di Banco | Maso di Banco |
| masochismo | masochism |
| masochista | masochist |
| masochistico | masochistic |
| Masolino da Panicale | Masolino da Panicale |
| Mason | Mason |
| Mason County | Mason County |
| masonite | hardboard |
| Mass damper | Tuned mass damper |
| mass media | media |
| Mass Transit Railway | MTR |
| massa | strike |
| massa a riposo | rest mass |
| massa atomica | atomic mass |
| massa critica | critical mass |
| massa d'acqua | body of water |
| Massa di Jeans | Jeans mass |
| Massa di Planck | Planck mass |
| Massa fusa | Melting |
| Massa grassa | Body fat percentage |
| massa intrinseca | rest mass |
| massa invariante | rest mass |
| Massa mancante | Missing mass |
| Massachusetts | Massachusetts |
| Massachusetts Bay Colony | Massachusetts Bay Colony |
| Massachusetts General Hospital | Massachusetts General Hospital |
| Massachusetts Institute of Technology | Massachusetts Institute of Technology |
| massacrante | backbreaking |
| massacrare | knock about |
| Massacri di settembre | September Massacres |
| Massacri hamidiani | Hamidian massacres |
| massacro | slaughter |
| Massacro al Virginia Polytechnic Institute | Virginia Tech massacre |
| Massacro alla scuola Jokela | Jokela school shooting |
| Massacro del Lago Bodom | Lake Bodom murders |
| Massacro della Columbine High School | Columbine High School massacre |
| Massacro della scuola di Jokela | Jokela school shooting |
| Massacro di Amritsar | Jallianwala Bagh massacre |
| Massacro di Biscari | Biscari massacre |
| Massacro di Bleiburg | Bleiburg massacre |
| Massacro di Dachau | Dachau massacre |
| Massacro di Deir Yassin | Deir Yassin massacre |
| Massacro di Ishaqi | Ishaqi incident |
| Massacro di Kfar Etzion | Kfar Etzion massacre |
| Massacro di Ludlow | Ludlow massacre |
| Massacro di Malmedy | Malmedy massacre |
| Massacro di Monaco | Munich massacre |
| Massacro di My Lai | My Lai Massacre |
| Massacro di Ponary | Ponary massacre |
| Massacro di Sand Creek | Sand Creek massacre |
| Massacro di Sharpeville | Sharpeville massacre |
| Massacro di Srebrenica | Srebrenica massacre |
| Massacro di Tlatelolco | Tlatelolco massacre |
| Massacro di Wounded Knee | Wounded Knee Massacre |
| Massacro scolastico | School shooting |
| massacro totale | wholesale slaughter |
| massaggiare | massage |
