| mlp | barg1252 | Bargam | N,
M,
Croisilles | 379 |
| mmi | musa1265 | Musar | N,
M,
C,
G,
N,
K,
T,
Nuclear Tibor | 343 |
| mmp | siaw1243 | Siawi | Amto-Musan | 101 |
| mmq | musa1266 | Musak | N,
M,
K,
S,
S,
E,
Aisian | 343 |
| mnx | mani1235 | Manikion | East Bird's Head | 42 |
| mnz | moni1261 | Moni | N,
Paniai Lakes | 43 |
| mnz | moni1261 | Moni (Kemandoga Dialect) | N,
Paniai Lakes | 71 |
| mok | moro1289 | Morori | T,
Moraori | 40 |
| moq | morb1239 | Mor | T,
Mor | 40 |
| mpp | miga1241 | Migabac | N,
F,
H,
E,
T,
H,
Sopac | 238 |
| mps | dadi1250 | Dadibi | Teberan | 102 |
| mpt | mian1256 | Mian | N,
A,
A,
O,
O,
M,
Mianic | 130 |
| mpv | mung1272 | Mungkip | N,
F,
F,
E,
Boana | 165 |
| mqe | mate1260 | Matepi | N,
M,
C,
M,
H,
Unclassified Hanseman | 360 |
| mqf | momu1241 | Momuna | Somahai | 34 |
| mqr | mand1443 | Mander | T,
Tor | 37 |
| mqs | west2600 | West Makian | W,
N,
West Makian | 257 |
| mqv | mosi1248 | Mosimo | N,
M,
C,
M,
H,
Wamas-Samosa-Murupi-Mosimo | 355 |
| mqw | muru1273 | Murupi | N,
M,
C,
M,
H,
Wamas-Samosa-Murupi-Mosimo | 382 |
| mrf | else1239 | Elseng | Language isolate | 134 |
| mrx | mare1261 | Dineor | T,
Tor | 7 |
| mrz | nucl1622 | Marind | A,
M,
Marindic | 40 |
| mrz | gawi1240 | Marind (Gawir Dialect) | A,
M,
M,
M,
Coastal Marind | 52 |
| msf | mekw1241 | Mekwei | N,
Outer Nimboranic | 41 |
| msg | mora1239 | Moraid | W,
South West Bird's Head | 37 |
| msl | molo1262 | Molof | Unclassified | 118 |
| mso | nucl1452 | Mombum | Mombum-Koneraw | 48 |
| msx | more1258 | Moresada | N,
M,
K,
S,
O,
P,
Anamuxric | 329 |
| msy | arua1260 | Aruamu | R,
L,
R,
Mikarewan | 64 |
| msz | moma1243 | Momare | N,
F,
H,
E,
T,
H,
Sopac | 55 |
| mtc | muni1257 | Munit | N,
M,
C,
M,
Kokon | 379 |
| mtf | muri1260 | Murik | L,
Nor | 144 |
| mtf | muri1260 | Murik (Karau Dialect) | L,
Nor | 107 |
| mtf | muri1260 | Murik (Wagamut Dialect) | L,
Nor | 88 |
| mtg | unaa1239 | Una | T,
M,
Eastern | 12 |
| mth | mung1269 | Munggui | A,
M,
E,
S,
C,
Y,
C,
Central Yapen | 39 |
| mti | maiw1251 | Maiwa | D,
Central Dagan | 247 |
| mtj | mosk1236 | Moskona (Merdey Dialect) | E,
Meax | 40 |
| mtj | mosk1236 | Moskona | E,
Meax | 38 |
| mtv | asar1240 | Asaro'o | N,
F,
F,
W,
N,
Molet-Asaroo | 47 |
| mty | nabi1239 | Nabi | N,
W,
C,
Wapeic | 51 |
| mvq | moer1240 | Moere | N,
M,
C,
G,
N,
K,
Kumil | 304 |
| mvr | mara1397 | Marau | A,
M,
E,
S,
C,
Y,
C,
Ansus-Ambai | 18 |
| mxn | moii1235 | Moi | W,
Seget-Moi | 61 |
| mxw | namo1246 | Namo | Y,
M,
N,
Namo-Len | 1 |
| mze | mora1273 | Morawa | Mailuan | 56 |
| naf | naba1256 | Nabak | N,
F,
H,
W,
R,
Sankwep | 193 |
| nbk | nake1240 | Nake | N,
M,
C,
M,
H,
Unclassified Hanseman | 370 |
| nca | iyoo1238 | Iyo | N,
F,
F,
G,
Ufim-Rawa-Nahu | 51 |
| nce | yale1246 | Nagatiman | Isolate | 102 |
