| meu | motu1246 | Motu | A,
M,
E,
O,
W,
P,
P,
C,
West Central Papuan linkage | 280 |
| kpx | moun1252 | Mountain Koiari | K,
K,
Biage-Mountain Koiali | 185 |
| akc | mpur1239 | Mpur (Arfu Dialect) | Language isolate | 40 |
| akc | mpur1239 | Mpur | Language isolate | 82 |
| akc | mpur1239 | Mpur (Kebar Dialect) | Language isolate | 52 |
| tsx | muba1238 | Mubami | A,
I,
West Inland Gulf of Papua | 206 |
| mfw | mula1254 | Mulaha | Kwalean | 150 |
| kqa | mumm1238 | Mum | N,
M,
K,
S,
S,
North Sogeram | 419 |
| mth | mung1269 | Munggui | A,
M,
E,
S,
C,
Y,
C,
Central Yapen | 39 |
| mpv | mung1272 | Mungkip | N,
F,
F,
E,
Boana | 165 |
| mtc | muni1257 | Munit | N,
M,
C,
M,
Kokon | 379 |
| asx | mura1271 | Muratayak | N,
F,
F,
W,
Nuclear Warup | 52 |
| mtf | muri1260 | Murik | L,
Nor | 144 |
| mtf | muri1260 | Murik (Wagamut Dialect) | L,
Nor | 88 |
| mtf | muri1260 | Murik (Karau Dialect) | L,
Nor | 107 |
| mqw | muru1273 | Murupi | N,
M,
C,
M,
H,
Wamas-Samosa-Murupi-Mosimo | 382 |
| mmq | musa1266 | Musak | N,
M,
K,
S,
S,
E,
Aisian | 343 |
| mmi | musa1265 | Musar | N,
M,
C,
G,
N,
K,
T,
Nuclear Tibor | 343 |
| kti | nort2916 | Muyu, North | N,
A,
A,
O,
O,
L,
Division A Lowland Ok | 102 |
| kts | sout2940 | Muyu, South | N,
A,
A,
O,
O,
L,
Division A Lowland Ok | 100 |
