| 86371 | Mailu (Ilai Dialect) | ʔaneʔa | | | Thomson (1975) | |
| 86645 | Mailu (Island Dialect) | ʔone | | | Thomson (1975) | |
| 221284 | Maiwa | 'nuge | | | SIL (1973) | |
| 36375 | Makasae | dana'kini | | | Stokhof (1975) | |
| 143014 | Mala | koŋor | | | Z'graggen (1980) | sand |
| 143009 | Malas | silep | | | Z'graggen (1980) | sand |
| 180056 | Male | ulel | | | Z'graggen (1980) | sand |
| 233151 | Mali (Arambum Dialect) | ǥungi | | | SIL (1985) | |
| 233274 | Mali (Makunga Dialect) | aƀunki | | | SIL (1985) | |
| 155211 | Mamaa | yuf | | | McElhanon and Voorhoeve (1970) | sand |
| 155216 | Ma Manda | kɨnkɨn namuk | | | McElhanon and Voorhoeve (1970) | sand |
| 155158 | Mandobo Atas | ŋgirim | | | McElhanon and Voorhoeve (1970) | sand |
| 29516 | Manem | pefjis | | | Voorhoeve (1971) | |
| 91280 | Mape | mageŋ | sand | | McElhanon (1967) | sand |
| 155246 | Mape (East Dialect) | mageŋ | | | McElhanon and Voorhoeve (1970) | sand |
| 155244 | Mape (Naga Dialect) | mageŋ | | | McElhanon and Voorhoeve (1970) | sand |
| 155245 | Mape (West Dialect) | mageŋ | | | McElhanon and Voorhoeve (1970) | sand |
| 258188 | Maria (Maiagolo Dialect) | kiˈbudi | | | Dutton (1970) | sand |
| 258190 | Maria (Maranomu Dialect) | kiˈbidi | | | Dutton (1970) | sand |
| 258192 | Maria (Uderi Dialect) | kiˈbudi | | | Dutton (1970) | sand |
| 258194 | Maria | kiˈbuti | | | Dutton (1970) | sand |
| 155178 | Marind (Gawir Dialect) | sa: | | | McElhanon and Voorhoeve (1970) | sand |
| 124019 | Matepi | ma:l | | | Z'graggen (1980) | sand |
| 143018 | Mauwake | sʌ: | | | Z'graggen (1980) | sand |
| 143022 | Mawak | sereb | | | Z'graggen (1980) | sand |
| 124017 | Mawan | giri | | | Z'graggen (1980) | sand |
| 77819 | Maybrat | snok | | | Dol (2007) | |
| 76945 | Mbaniata | ōne | sand | | Tryon & Hackman (1983) | |
| 76821 | Mbaniata (Lokuru Dialect) | ōne | sand | | Tryon & Hackman (1983) | |
| 76549 | Mbilua | karokoni | sand | | Tryon & Hackman (1983) | |
| 76272 | Mbilua (Ndovele Dialect) | karokoni | sand | | Tryon & Hackman (1983) | |
| 263 | Mena | kiki | | | Franklin (1973) | |
| 4791 | Menya | hika we | | | Lloyd (1973) | |
| 155236 | Mesem | gʌŋʌ | | | McElhanon and Voorhoeve (1970) | sand |
| 91274 | Mesem | gaŋa | sand | | McElhanon (1967) | sand |
| 143017 | Miani | r̃asab | | | Z'graggen (1980) | sand |
| 218322 | Migabac | ʒiŋoŋ | | | SIL (1975) | |
| 155238 | Migabac | dziŋɔŋ | | | McElhanon and Voorhoeve (1970) | sand |
| 180036 | Migum | yʌr̃ | | | Z'graggen (1980) | sand |
| 3060 | Minanibai | miri | | | Franklin (1973) | |
| 143020 | Moere | pemu | | | Z'graggen (1980) | sand |
| 29600 | Molof | korofek | | | Voorhoeve (1971) | |
| 155239 | Momare | diŋiŋ | | | McElhanon and Voorhoeve (1970) | sand |
| 155173 | Mombum | sir | | | McElhanon and Voorhoeve (1970) | sand |
| 6282 | Moni (Kemandoga Dialect) | tadi | | | Larson & Larson (1972) | |
| 192939 | Moresada | aseŋʌmp | | | Z'graggen (1980) | sand |
| 3479 | Morigi | wio | | | Wurm (1973) | |
| 124010 | Mosimo | kihare | | | Z'graggen (1980) | sand |
| 258197 | Motu | raria | | | Dutton (1970) | sand |
| 258196 | Motu | miri | | | Dutton (1970) | sand |
