word | | Nationality |
| Maltese | Malta | noun: Maltese (singular and plural) adjective: Maltese |
| Manx | Isle of Man | noun: Manxman (men), Manxwoman (women) adjective: Manx |
| Manxman | Isle of Man | noun: Manxman (men), Manxwoman (women) adjective: Manx |
| Manxwoman | Isle of Man | noun: Manxman (men), Manxwoman (women) adjective: Manx |
| Marshallese | Marshall Islands | noun: Marshallese (singular and plural) adjective: Marshallese |
| Mauritanian | Mauritania | noun: Mauritanian(s) adjective: Mauritanian |
| Mauritian | Mauritius | noun: Mauritian(s) adjective: Mauritian |
| men | France | noun: Frenchman(men), Frenchwoman(women) adjective: French |
| men | Ireland | noun: Irishman(men), Irishwoman(women), Irish (collective plural) adjective: Irish |
| men | Isle of Man | noun: Manxman (men), Manxwoman (women) adjective: Manx |
| men | Netherlands | noun: Dutchman(men), Dutchwoman(women) adjective: Dutch |
| men | Saint Pierre and Miquelon | noun: Frenchman(men), Frenchwoman(women) adjective: French |
| Mexican | Mexico | noun: Mexican(s) adjective: Mexican |
| Micronesian | Micronesia, Federated States of | noun: Micronesian(s) adjective: Micronesian; Chuukese, Kosraen(s), Pohnpeian(s), Yapese |
| Moldovan | Moldova | noun: Moldovan(s) adjective: Moldovan |