| 60793 | Mekens-ICR-RH | i-, se- | | | Vilacy (2001) | |
| 60409 | Mekens_ICR_TCC | i | | | Galucio (2001) | |
| 60183 | Mekens-ICR-WB | te | | | Vilacy Galucio, Ana. 2001 () | |
| 41331 | Mende | sihi | | | Hoel et al. (1994) | |
| 35418 | Menya | kiqä | | | Whitehead (2004) | |
| 42627 | Meriam | ábra | | | Piper (1989) | |
| 50827 | Mewati | i | | | Gusain (2003) | |
| 40266 | Meyah | efen | | | Gravelle (2004) | |
| 39875 | Mian | ó | | | Fedden (2007) | |
| 30755 | Mian | é | | | Fedden (2007) | |
| 30756 | Mian | ó | | | Fedden (2007) | |
| 43872 | Modern Hebrew | -a | | | Glinert (1989) | |
| 31145 | Moken | ñaa | | | Veena (1980) | |
| 31146 | Moken | ʔolaaŋ | | | Veena (1980) | |
| 46647 | Mombum | ɛwɛ | | | Boelaars (1950) | |
| 48823 | Mongolian (Halh Dialect) | tuunii | | | Gaunt and Bayarmandakh (2004) | |
| 50023 | Mono | -na | | | Evans (2015) | |
| 45791 | Morisyen | so | | | Baker (1972) | |
| 43619 | Moroccan Arabic | -ha | | | Harrell (1962) | |
| 35146 | Moskona | ofon | | | Gravelle (2010) | |
| 60889 | Mpakwithi | ŋyumɽu | | | Dixon (1981) | |
| 61792 | Mpur | n- | | | Odé (2002) | |
| 40635 | Mufian | éko'wi- | | | Conrad et al. (1978) | |
| 52535 | Muinane | i- | | | Walton, Hensarling and Maxwell (2000) | |
| 57113 | Mumuye (Zing Dialect) | wu | | | Shimizu (1983) | |
| 34752 | Muna | -no | | | van den Berg (1989) | |
| 60279 | Mundari-ICR-KQ | ayaʔ | | | Osada (1992) | |
| 59991 | Mundari-ICR-LB | ayʔ | | | Osada (1992) | |
| 60468 | Mundari_ICR_TCC | ayaʔ | | | Osada (1992) | |
| 59168 | Mungbam (Abar Dialect) | wu˧, wu˥ | | | Lovegren (2013) | |
| 59214 | Mungbam (Biya Dialect) | wə˧, wə˥ | | | Lovegren (2013) | |
| 59262 | Mungbam (Missong Dialect) | wu˥ | | | Lovegren (2013) | |
| 59110 | Mungbam (Munken Dialect) | wu˧, wu˥ | | | Lovegren (2013) | |
| 59309 | Mungbam (Ngun Dialect) | wɩn˧, wɩn˥ | | | Lovegren (2013) | |
| 53714 | Murui Huitoto | naiɲaiɲo | | | Piñeros and Roselli (2000) | |
| 25494 | Muruwari | puka | | | Oates (1988) | |
| 47865 | Mussau-Emira | -na | | | Lynch et al. (2002) | |
| 47875 | Mussau-Emira | -na | | | Lynch et al. (2002) | |
| 40875 | Naasioi | ba- | | | Onishi (2004) | |
| 30437 | Nabak | egalen | | | Fabian et al. (1998) | |
| 53379 | Nadëb | ta- | | | Bolaños and Epps (2009) | |
| 59599 | Nama | yəne | | | Evans et al (2017) | |
| 22328 | Nambu | yäne | | | Evans (2013) | |
| 41695 | Namia | ekoka | | | Feldpausch and Feldpausch (1992) | |
| 59695 | Namo (Tais Dialect) | yæne | | | Evans et al (2017) | |
| 58357 | Nateni | nɩ˧ | | | Neukom (1995) | |
| 56645 | Nawuri | mò | | | Sherwood (1982) | |
| 29115 | Ndjébbana | -ŋaya | | | McKay (2000) | |
| 46599 | Ndom | ɛfɛ | | | Boelaars (1950) | |
| 55703 | Ndut | -i | vowel undergoes ATR harmony | | Morgan (1996) | |
