| 158157 | Muyu, South | baŋkau | | | McElhanon and Voorhoeve (1970) | long |
| 158156 | Muyu, North | kataat | | | McElhanon and Voorhoeve (1970) | long |
| 144362 | Musar | enian | | | Z'graggen (1980) | long |
| 193723 | Musak | garaŋ | | | Z'graggen (1980) | long |
| 125531 | Murupi | wau | | | Z'graggen (1980) | long |
| 240709 | Murik (Wagamut Dialect) | ˈgogoŋ | | | Abbott (1985) | |
| 240612 | Murik (Karau Dialect) | ˈgogoŋgo | | | Abbott (1985) | |
| 158176 | Muratayak | sunbɛm | | | McElhanon and Voorhoeve (1970) | long |
| 125520 | Munit | biʌːtbi | | | Z'graggen (1980) | long |
| 198613 | Mungkip | wan | | | Retsema et al. (2009) | |
| 193713 | Mum | kuːta | | | Z'graggen (1980) | long |
| 258915 | Mulaha | biroki | | | Dutton (1970) | long |
| 3395 | Mubami | goliolive | | | Franklin (1973) | |
| 27469 | Mubami | golioliwo | | | Reesink (1976) | |
| 3443 | Mubami | lolo | | | Franklin (1973) | |
| 3405 | Mubami | lozo | | | Franklin (1973) | |
| 14858 | Mountain Koiari | ege|a | to be long | | Dutton (2010) | |
| 14857 | Mountain Koiari | ege|tana | long | | Dutton (2010) | |
| 258914 | Motu | lata | | | Dutton (1970) | long |
| 125534 | Mosimo | wau | | | Z'graggen (1980) | long |
| 3497 | Morigi | tuturu | | | Wurm (1973) | |
| 193718 | Moresada | siwi- | | | Z'graggen (1980) | long |
| 158223 | Momare | dariʔ | | | McElhanon and Voorhoeve (1970) | long |
| 29582 | Molof | worjomo | | | Voorhoeve (1971) | |
| 144358 | Moere | yen | | | Z'graggen (1980) | long |
| 3078 | Minanibai | gorivo | | | Franklin (1973) | |
| 181415 | Migum | goijo | | | Z'graggen (1980) | long |
| 158222 | Migabac | dzariʔ | | | McElhanon and Voorhoeve (1970) | long |
| 218346 | Migabac | ʒalicne | | | SIL (1975) | |
| 144355 | Miani | wanak | | | Z'graggen (1980) | long |
| 158159 | Mian | teke | | | McElhanon and Voorhoeve (1970) | long |
| 90770 | Mesem | kepṃ | long | | McElhanon (1967) | long |
| 4809 | Menya | qwaavqa | | | Lloyd (1973) | |
| 281 | Mena | samakuvu | | | Franklin (1973) | |
| 76447 | Mbilua (Ndovele Dialect) | rosi | long | | Tryon & Hackman (1983) | |
| 76630 | Mbilua | ros i-ama | long | | Tryon & Hackman (1983) | |
| 76697 | Mbaniata (Lokuru Dialect) | hofuta | long | | Tryon & Hackman (1983) | |
| 76968 | Mbaniata | hofuta | long | | Tryon & Hackman (1983) | |
| 125541 | Mawan | duruːg | | | Z'graggen (1980) | long |
| 144360 | Mawak | sekat | | | Z'graggen (1980) | long |
| 144356 | Mauwake | maya | | | Z'graggen (1980) | long |
| 125544 | Matepi | durug | | | Z'graggen (1980) | long |
| 158172 | Marind (Gawir Dialect) | wagatok | | | McElhanon and Voorhoeve (1970) | long |
| 258912 | Maria | ˈkeke | | | Dutton (1970) | long |
| 258910 | Maria (Uderi Dialect) | ˈgege | | | Dutton (1970) | long |
| 258908 | Maria (Maranomu Dialect) | ˈgege | | | Dutton (1970) | long |
| 258906 | Maria (Maiagolo Dialect) | ˈgege | | | Dutton (1970) | long |
| 158229 | Mape (West Dialect) | dzora | | | McElhanon and Voorhoeve (1970) | long |
| 158228 | Mape (Naga Dialect) | dzori | | | McElhanon and Voorhoeve (1970) | long |
| 90776 | Mape | dzoraikne | long | | McElhanon (1967) | long |
