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M
| Language name | Native name | Code |
|---|---|---|
| Macedonian | Македонски Јазик | MAC |
| Madurese | - | MAD |
| Magahi | - | MAG |
| Maithili | मैथिली | MAI |
| Makasar | - | MAK |
| Malagasy | Malagasy Fiteny | MLG |
| Malay | Bahasa Melayu, بهاس ملايو | MAY |
| Malayalam | മലയാളം | MAL |
| Maltese | Malti | MLT |
| Manchu | ᠮᠠᠨᠵᡠ ᡤᡳᠰᡠᠨ ᠪᡝ | MNC |
| Mandar | - | MDR |
| Mandingo | - | MAN |
| Manipuri | মৈইতৈইলোন | MNI |
| Manobo languages | - | MNO |
| Manx | Gaelg, Manninagh | GLV |
| Maori | Te Reo Māori | MAO |
| Mapudungun; Mapuche | Mapudungun, Mapuchedungun | ARN |
| Marathi | मराठी | MAR |
| Mari | Марий Йылме | CHM |
| Marshallese | Kajin M̧ajeļ | MAH |
| Marwari | मारवाड़ी | MWR |
| Masai | Ɔl Maa | MAS |
| Mayan languages | - | MYN |
| Mende | Mɛnde | MEN |
| Mi'kmaq; Micmac | Míkmaq, Mi'gmaq | MIC |
| Minangkabau | Baso Minangkabau | MIN |
| Mirandese | Lhéngua Mirandesa | MWL |
| Mohawk | Kanien’Keha | MOH |
| Moksha | Мокшень Кяль | MDF |
| Mon-Khmer languages | - | MKH |
| Mongo | - | LOL |
| Mongolian | Монгол Хэл | MON |
| Mossi | Mòoré | MOS |
| Multiple languages | - | MUL |
| Munda languages | - | MUN |