| mhd | | Mbugu (Normal Dialect) | M,
Bantu-Cushitic | 44 |
| mgf | | Maklew | Yelmek-Maklew | 64 |
| mfe | | Morisyen | C,
French based | 48 |
| mej | | Meyah | E,
E,
Meax | 48 |
| mec | | Mara | A,
G,
M,
Mara | 76 |
| mdm | | Mayogo | N,
A,
V,
N,
A,
U,
S,
N,
N,
E,
Mayogo-Bangba | 48 |
| mcs | | Mambay | N,
A,
V,
N,
A,
A,
M,
M,
N,
Tupuri-Mambai | 48 |
| mcr | | Menya | T,
A,
Nuclear Angan | 76 |
| mbn | | Macaguán | | 88 |
| max | | Malay (North-Moluccan Dialect) | Austronesian | 48 |
| maw | | Mampruli | N,
A,
V,
N,
G,
C,
N,
O,
W,
Southeast | 48 |
| mal | | Malayalam | D,
S,
T,
T,
T,
Malayalam | 48 |
| mak | | Makassarese | A,
M,
S,
Makassar | 76 |
| mai | | Maithili | I,
I,
I,
E,
Bihari | 48 |
| mad | | Madurese | A,
M,
Madurese | 77 |
| lrt | | Malay (Larantuka Dialect) | Austronesian | 48 |
| khk | | Mongolian (Halh Dialect) | M,
E,
O,
K,
Mongolian Proper | 48 |
| huu | | Murui Huitoto | | 48 |
| heb | | Modern Hebrew | A,
S,
C,
S,
Canaanite | 48 |
| had | | Mansim | Mansim-Hatam | 48 |
| gwa | | Mbato | N,
A,
V,
K,
N,
P,
Potou | 48 |
| gut | | Malecu | C,
Votic | 28 |
| emi | | Mussau-Emira | A,
M,
C,
E,
O,
St. Matthias | 82 |
| dmd | | Mathi-Mathi | A,
Kulin | 59 |
| cmn | | Mandarin | S,
Chinese | 24 |
| bpq | | Malay (Banda Dialect) | Austronesian | 48 |
| bmr | | Muinane | | 48 |
| awg | | Mpakwithi | P,
P,
N,
N,
Anguthimri | 48 |
| ary | | Moroccan Arabic | A,
S,
C,
S,
Arabic | 48 |
| aoj | | Mufian | T,
K,
Arapesh | 48 |
| akc | | Mpur | N,
Isolate | 48 |
| abs | | Malay (Ambon Dialect) | Austronesian | 48 |
| aax | | Mandobo | T,
O,
A,
Dumut | 48 |
| | Mblafe | Y,
Tonda Branch | 76 |
