| 163391 | Lembena (Yariba Dialect) | xa't̮ɕe | | | Davies and Comrie (1985) | road |
| 160138 | Madi | kɛtʌ | | | McElhanon and Voorhoeve (1970) | road |
| 75338 | Mailu | laea | | | Saville (1912) | |
| 86106 | Mailu (Asiaoro Dialect) | laea | path | | Thomson (1975) | path |
| 87476 | Mailu (Baibara Dialect) | laea | path | | Thomson (1975) | path |
| 86928 | Mailu (Borebo Dialect) | laea | path | | Thomson (1975) | path |
| 88298 | Mailu (Darava Dialect) | laea | path | | Thomson (1975) | path |
| 88024 | Mailu (Delebai Dialect) | laea | path | | Thomson (1975) | path |
| 87202 | Mailu (Domara Dialect) | laea | path | | Thomson (1975) | path |
| 87750 | Mailu (Geagea Dialect) | laea | path | | Thomson (1975) | path |
| 86380 | Mailu (Ilai Dialect) | laea | path | | Thomson (1975) | path |
| 86654 | Mailu (Island Dialect) | laea | path | | Thomson (1975) | path |
| 217803 | Maiwa | ɛbu | Daga - nain | | SIL (1967) | |
| 221206 | Maiwa | 'ɛbu | | | SIL (1973) | |
| 36372 | Makasae | 'iʔa (O) iar | path | | Stokhof (1975) | |
| 233113 | Mali (Arambum Dialect) | iskaʰ | | | SIL (1985) | |
| 233215 | Mali (Makunga Dialect) | aⁱskaʰ | | | SIL (1985) | |
| 160166 | Mamaa | kʌdiminaŋ | | | McElhanon and Voorhoeve (1970) | road |
| 160171 | Ma Manda | kʌdet | | | McElhanon and Voorhoeve (1970) | road |
| 29514 | Manem | monofo | road/path | | Voorhoeve (1971) | road/path |
| 91210 | Mape | kari | road | | McElhanon (1967) | road |
| 160199 | Mape (East Dialect) | kari | | | McElhanon and Voorhoeve (1970) | road |
| 160198 | Mape (Naga Dialect) | yape | | | McElhanon and Voorhoeve (1970) | road |
| 160132 | Marind (Gawir Dialect) | isas | | | McElhanon and Voorhoeve (1970) | road |
| 77852 | Maybrat | iso | | | Dol (2007) | |
| 76875 | Mbaniata | e | road | | Tryon & Hackman (1983) | |
| 76787 | Mbaniata (Lokuru Dialect) | e | road | | Tryon & Hackman (1983) | |
| 76518 | Mbilua | keve | road | | Tryon & Hackman (1983) | |
| 76340 | Mbilua (Ndovele Dialect) | keve | road | | Tryon & Hackman (1983) | |
| 160194 | Mesem | kʌtʌrʌm | | | McElhanon and Voorhoeve (1970) | road |
| 91204 | Mesem | kə | road | | McElhanon (1967) | road |
| 160115 | Mian | reip | | | McElhanon and Voorhoeve (1970) | road |
| 160196 | Migabac | yefe | | | McElhanon and Voorhoeve (1970) | road |
| 218234 | Migabac | jefe | | | SIL (1975) | |
| 29597 | Molof | mef | road/path | | Voorhoeve (1971) | road/path |
| 7307 | Moni (Kemandoga Dialect) | kejako | | | Larson & Larson (1972) | |
| 32334 | Morawa | nara | | | SIL (1973) | |
| 15452 | Mountain Koiari | huma|ha | path, road | | Dutton (2010) | |
| 27453 | Mubami | idi | path | | Reesink (1976) | path |
| 83041 | Mum | kuᵐbɨ | | | Daniels (2010) | |
| 160176 | Mungkip | tɛlɛ | | | McElhanon and Voorhoeve (1970) | road |
| 198625 | Mungkip | tɛrɛpmēŋ | | | Retsema et al. (2009) | |
| 160136 | Muratayak | yam | | | McElhanon and Voorhoeve (1970) | road |
| 240547 | Murik (Karau Dialect) | ˈiagabol | | | Abbott (1985) | |
| 240651 | Murik (Wagamut Dialect) | ˈiagabor̃ | | | Abbott (1985) | |
| 160114 | Muyu, North | yontom | | | McElhanon and Voorhoeve (1970) | road |
| 160193 | Nabak | set | | | McElhanon and Voorhoeve (1970) | road |
| 91215 | Nabak | set | road | | McElhanon (1967) | road |
| 197810 | Nagatiman | ařʌgɛʔ | | | Conrad and Dye (1975) | |
| 214069 | Nakai | dlˈl̪ip | | | Hughes (2009) | |
