| nnk | nank1250 | Nankina | N,
F,
F,
Yupna | 59 |
| mxw | namo1246 | Namo | Y,
M,
N,
Namo-Len | 1 |
| nnm | nami1256 | Namia | S,
Yellow River | 90 |
| ncm | namb1293 | Nambu (Keraki Dialect) | Y,
M,
Nambu | 1 |
| ncm | namb1293 | Nambu (Parb Dialect) | Y,
M,
Nambu | 1 |
| nlc | nalc1240 | Nalca | N,
M,
Western Mek | 41 |
| nbk | nake1240 | Nake | N,
M,
C,
M,
H,
Unclassified Hanseman | 370 |
| nib | naka1264 | Nakame (Sikalan Dialect) | N,
F,
F,
E,
Boana | 119 |
| nib | naka1264 | Nakame | N,
F,
F,
E,
Boana | 52 |
| nib | naka1264 | Nakame (Munguleng Dialect) | N,
F,
F,
E,
Boana | 137 |
| nib | naka1264 | Nakame (Wasin Dialect) | N,
F,
F,
E,
Boana | 119 |
| nib | naka1264 | Nakame (Popof Dialect) | N,
F,
F,
E,
Boana | 128 |
| nib | naka1264 | Nakame (Gufin Dialect) | N,
F,
F,
E,
Boana | 77 |
| nib | naka1264 | Nakame (Sokan Dialect) | N,
F,
F,
E,
Boana | 119 |
| nib | naka1264 | Nakame (Dzenzen Dialect) | N,
F,
F,
E,
Boana | 123 |
| nkj | naka1265 | Nakai | N,
A,
A,
O,
O,
Tangko-Nakai | 215 |
| nce | yale1246 | Nagatiman | Isolate | 102 |
| nxx | nafr1241 | Nafri | S,
N,
Sentani-Nafri | 41 |
| mty | nabi1239 | Nabi | N,
W,
C,
Wapeic | 51 |
| naf | naba1256 | Nabak | N,
F,
H,
W,
R,
Sankwep | 193 |
| kts | sout2940 | Muyu, South | N,
A,
A,
O,
O,
L,
Division A Lowland Ok | 100 |
| kti | nort2916 | Muyu, North | N,
A,
A,
O,
O,
L,
Division A Lowland Ok | 102 |
| mmi | musa1265 | Musar | N,
M,
C,
G,
N,
K,
T,
Nuclear Tibor | 343 |
| mmq | musa1266 | Musak | N,
M,
K,
S,
S,
E,
Aisian | 343 |
| mqw | muru1273 | Murupi | N,
M,
C,
M,
H,
Wamas-Samosa-Murupi-Mosimo | 382 |
| mtf | muri1260 | Murik (Karau Dialect) | L,
Nor | 107 |
| mtf | muri1260 | Murik (Wagamut Dialect) | L,
Nor | 88 |
| mtf | muri1260 | Murik | L,
Nor | 144 |
| asx | mura1271 | Muratayak | N,
F,
F,
W,
Nuclear Warup | 52 |
| mtc | muni1257 | Munit | N,
M,
C,
M,
Kokon | 379 |
| mpv | mung1272 | Mungkip | N,
F,
F,
E,
Boana | 165 |
| mth | mung1269 | Munggui | A,
M,
E,
S,
C,
Y,
C,
Central Yapen | 39 |
| kqa | mumm1238 | Mum | N,
M,
K,
S,
S,
North Sogeram | 419 |
| mfw | mula1254 | Mulaha | Kwalean | 150 |
| tsx | muba1238 | Mubami | A,
I,
West Inland Gulf of Papua | 206 |
| akc | mpur1239 | Mpur | Language isolate | 82 |
| akc | mpur1239 | Mpur (Arfu Dialect) | Language isolate | 40 |
| akc | mpur1239 | Mpur (Kebar Dialect) | Language isolate | 52 |
| kpx | moun1252 | Mountain Koiari | K,
K,
Biage-Mountain Koiali | 185 |
| meu | motu1246 | Motu | A,
M,
E,
O,
W,
P,
P,
C,
West Central Papuan linkage | 280 |
| mtj | mosk1236 | Moskona | E,
Meax | 38 |
| mtj | mosk1236 | Moskona (Merdey Dialect) | E,
Meax | 40 |
| mqv | mosi1248 | Mosimo | N,
M,
C,
M,
H,
Wamas-Samosa-Murupi-Mosimo | 355 |
| mok | moro1289 | Morori | T,
Moraori | 40 |
| mdb | mori1271 | Morigi | K,
Turama-Kerewo | 99 |
| msx | more1258 | Moresada | N,
M,
K,
S,
O,
P,
Anamuxric | 329 |
| mze | mora1273 | Morawa | Mailuan | 56 |
| mhz | morm1235 | Mor (Austronesian) | A,
M,
E,
South Halmahera-West New Guinea | 52 |
| msg | mora1239 | Moraid | W,
South West Bird's Head | 37 |
| moq | morb1239 | Mor | T,
Mor | 40 |
