| msjMa | msj | Niger–Congo | | | 6a · Vigorous |
| mhyMa'anyan | mhy | Austronesian | | 150,000 | 6b · Threatened |
| mhiMa'di | mhi | Nilo-Saharan | | | 5 · Developing |
| slzMa'yabahasa Ma'ya | slz | Austronesian | | | 6b · Threatened |
| cmaMaa | cma | — | | | 6a · Vigorous |
| mxuMaɗa | mxu | Afroasiatic | | | 6a · Vigorous |
| mewMaaka | mew | Afroasiatic | | | 6a · Vigorous |
| mdyMaale | mdy | — | | 94,700 | 5 · Developing |
| masMaasai | mas | Nilo-Saharan | | | 5 · Developing |
| ymmMaay | ymm | Afroasiatic | | | 5 · Developing |
| mqaMaba | mqa | Austronesian | | | 6a · Vigorous |
| mdeMaba | mde | Nilo-Saharan | | 296,000 | 3 · Wider Communication |
| mujMabire | muj | Afroasiatic | | | 10 · Extinct |
| mclMacaguaje | mcl | Tucanoan | | | 9 · Dormant |
| mbnMacaguán | mbn | Guajiboan | | 513 | 6b · Threatened |
| mzsMacanese | mzs | — | | 50 | 8b · Nearly Extinct |
| mkdMacedonianмакедонски јазик | mkd | Indo-European | +3 | 2 m | 1 · National |
| jmcMachame | jmc | — | | | 5 · Developing |
| mcbMachiguenga | mcb | Southern Maipuran | | 6,200 | 5 · Developing |
| mpdMachinere | mpd | Piro | | | 7 · Shifting |
| wpcMaco | wpc | Piaroa–Saliban | | 2,500 | 6a · Vigorous |
| myyMacunaMasa ye | myy | Tucanoan | | 1,032 | 6a · Vigorous |
| mbcMacushi | mbc | Cariban | | 9,600 | 6b · Threatened |
| mzcMadagascar Sign Language | mzc | — | | | 5 · Developing |
| mmxMadak | mmx | Austronesian | | | 6b · Threatened |
| dmdMadhi Madhi | dmd | Australian Aboriginal languages | | | 9 · Dormant |
| grgMadi | grg | Trans–New Guinea | | | 8a · Moribund |
| madMadureseBhâsa Madhurâ | mad | Austronesian | +1 | 15 m | 5 · Developing |
| mmeMae | mme | Austronesian | | | 6a · Vigorous |
| ittMaeng Itneg | itt | Austronesian | | | 6a · Vigorous |
| mafMafa | maf | Afroasiatic | | | 5 · Developing |
| gkdMagɨ | gkd | Trans–New Guinea | | | 8a · Moribund |
| sgbMag-antsi | sgb | Austronesian | | | 5 · Developing |
| mtwMagahat | mtw | Austronesian | | | 6a · Vigorous |
| magMagahiमगही | mag | Indo-European | | 20.7 m | 4 · Educational |
| gmdMaghdi | gmd | Niger–Congo | | | 6b · Threatened |
| zgrMagori | zgr | Austronesian | | | 8b · Nearly Extinct |
| mdhMaguindanao | mdh | Austronesian | | 1.1 m | 5 · Developing |
| mheMah Meri | mhe | Austroasiatic | | | 6b · Threatened |
| mjxMahali | mjx | Austroasiatic | | | 6b · Threatened |
| pmhMaharashtri | pmh | Indo-European | | | |
| bfzMahasu Pahari | bfz | — | | | 6a · Vigorous |
| mxlMahi | mxl | Niger–Congo | | | 6a · Vigorous |
| mjyMahicanMã’eekaneeweexthowãakan | mjy | Algic | | | |
| mhbMahongwe | mhb | Niger–Congo | | | 8a · Moribund |
| sksMaia | sks | — | | 4,400 | 6a · Vigorous |
| tnhMaiani | tnh | Trans–New Guinea | | | 5 · Developing |
| nmuMaidu | nmu | Maiduan | | | 9 · Dormant |
| mmmMaii | mmm | Austronesian | | 180 | 6b · Threatened |
| mguMailu | mgu | Trans–New Guinea | | | 5 · Developing |
| vmfMain-FranconianMainfränkisch | vmf | Indo-European | | | 6a · Vigorous |
| xklMainstream Kenyahbahasa Kenyah | xkl | Austronesian | | | 6b · Threatened |
| mbqMaisin | mbq | — | | 2,600 | 5 · Developing |
| maiMaithiliमैथिली | mai | Indo-European | | 34.1 m | 2 · Provincial |
| mtiMaiwa | mti | — | | | 5 · Developing |
| wmmMaiwa | wmm | — | | | 6a · Vigorous |
| mpeMajang | mpe | — | | 18,500 | 4 · Educational |
| xmjMajera | xmj | Afroasiatic | | | 6b · Threatened |
| mjzMajhi | mjz | Indo-European | | | 6b · Threatened |
| mmjMajhwar | mmj | Austroasiatic | | | 7 · Shifting |
| kmdMajukayang Kalinga | kmd | Austronesian | | | 6a · Vigorous |
| mkgMak | mkg | Kra–Dai | | | 7 · Shifting |
| pblMak | pbl | Niger–Congo | | | 6a · Vigorous |
| mcaMaká | mca | Matacoan | | | 5 · Developing |
| mcpMakaa | mcp | Niger–Congo | | | 5 · Developing |
| myhMakah | myh | Wakashan | | | 9 · Dormant |
| mjbMakalero | mjb | — | | | 6a · Vigorous |
| mkzMakasae | mkz | — | | | 6a · Vigorous |
| makMakassarBasa Mangkasaraʼ | mak | Austronesian | | 1.6 m | 6b · Threatened |
| mfpMakassar Malaybahasa Melayu Makassar | mfp | Austronesian | | | 9 · Second language only |
| vmwMakhuwa | vmw | Niger–Congo | | 7.4 m | 5 · Developing |
| mghMakhuwa-Meetto | mgh | Niger–Congo | | | 5 · Developing |
| vmkMakhuwa-Shirima | vmk | Niger–Congo | | | 5 · Developing |
| mgfMaklewbahasa Maklew | mgf | — | | | 6b · Threatened |
| zmhMakolkol | zmh | East New Britain | | | 9 · Dormant |
| kdeMakonde | kde | Niger–Congo | | 1.7 m | 5 · Developing |
| xakMáku | xak | — | | | 10 · Extinct |
| nmkMakura | nmk | Austronesian | | | 6a · Vigorous |
| mpuMakurap | mpu | Tupian | | | 8a · Moribund |
| lvaMakuv'a | lva | Austronesian | | | 8b · Nearly Extinct |
| ymkMakwe | ymk | Niger–Congo | | 119,700 | 6b · Threatened |
| mlfMal | mlf | Austroasiatic | | | 5 · Developing |
| mkbMal Paharia | mkb | Indo-European | | | 6b · Threatened |
| imaMala Malasar | ima | Dravidian | | | 6a · Vigorous |
| ccmMalaccan Creole Malay | ccm | — | | | 8a · Moribund |
| mlgMalagasyFiteny malagasy | mlg | Austronesian | | 18.1 m | |
| mpbMalak-Malak | mpb | — | | | 8b · Nearly Extinct |
| mmtMalalamai | mmt | Austronesian | | | 6a · Vigorous |
| mlnMalango | mln | Austronesian | | | 6a · Vigorous |
| mjpMalapandaram | mjp | Dravidian | | | 6b · Threatened |
| mjqMalaryan | mjq | Dravidian | | | 9 · Dormant |
| mqzMalasanga | mqz | Austronesian | | 1,200 | 6a · Vigorous |
| ymrMalasar | ymr | Dravidian | | | 6a · Vigorous |
| mjrMalavedan | mjr | Dravidian | | | 6b · Threatened |
| lonMalawi Lomwe | lon | Niger–Congo | | | 6a · Vigorous |
| swkMalawi Sena | swk | Niger–Congo | | | 5 · Developing |
| msaMalayBahasa Melayu | msa | Austronesian | +15 | 77 m | |
| mlzMalay Aklanon | mlz | Austronesian | | | 6a · Vigorous |
| malMalayalamമലയാളം | mal | Dravidian | | 37.1 m | 2 · Provincial |
| xmlMalaysian Sign Language | xml | — | | | 5 · Developing |
| bfoMalba Birifor | bfo | Niger–Congo | | | 5 · Developing |
| divMaldivianދިވެހި | div | Indo-European | | 340,500 | 1 · National |
| pqmMalecite-Passamaquoddyskicinuwatuwewakon | pqm | Algic | | 590 | 8a · Moribund |
| gutMaléku | gut | Chibchan | | | 7 · Shifting |
| pktMaleng | pkt | Austroasiatic | | | 6b · Threatened |
| mlxMalfaxal | mlx | Austronesian | | | 6a · Vigorous |
| vmlMalgana | vml | Australian Aboriginal languages | | | 10 · Extinct |
| mxfMalgbe | mxf | Afroasiatic | | | 6b · Threatened |
| gccMali | gcc | East New Britain | | | 6a · Vigorous |
| mgqMalila | mgq | Niger–Congo | | | 6a · Vigorous |
| mliMalimpung | mli | Austronesian | | | 6a · Vigorous |
| tcfMalinaltepec Me'phaa | tcf | Central American Indian languages | | | 5 · Developing |
| mltMalteseMalti | mlt | — | +2 | 482,880 | 1 · National |
| mdlMaltese Sign Language | mdl | — | | | 5 · Developing |
| mllMalua Bay | mll | Austronesian | | 600 | 6b · Threatened |
| mupMalvi | mup | Indo-European | | 10 m | 5 · Developing |
| mamMam | mam | Central American Indian languages | | | 4 · Educational |
| mmaMama | mma | Niger–Congo | | | 6a · Vigorous |
| mhfMamaa | mhf | Trans–New Guinea | | | 8b · Nearly Extinct |
| wmdMamaindê | wmd | Nambikwaran | | 340 | 6b · Threatened |
| mmnMamanwa | mmn | Austronesian | | | 5 · Developing |
| mqjMamasa | mqj | Austronesian | | | 6a · Vigorous |
| mgmMambai | mgm | Austronesian | | 130,000 | 6a · Vigorous |
| mvdMamborubahasa Mamboru | mvd | Austronesian | | | 6a · Vigorous |
| mgrMambwe-Lungu | mgr | Niger–Congo | | 674,000 | 5 · Developing |
| mawMampruli | maw | Niger–Congo | | | 2 · Provincial |
| mqxMamuju | mqx | Austronesian | | 63,000 | 6b · Threatened |
| mdiMamvu | mdi | Nilo-Saharan | | | 6a · Vigorous |
| mmlMan Met | mml | Austroasiatic | | | 6b · Threatened |
| xmmManado Indonesianbahasa Melayu Manado | xmm | — | | 850,000 | 3 · Wider Communication |
| mvaManam | mva | Austronesian | | | 5 · Developing |
| nmmManang | nmm | Bodish | | | 6b · Threatened |
| mncManchuᠮᠠᠨᠵᡠ ᡤᡳᠰᡠᠨ | mnc | Tungusic | | 20 | 8b · Nearly Extinct |
| mgsManda | mgs | Niger–Congo | | | 6a · Vigorous |
| zmaManda | zma | Western Daly | | 25 | 10 · Extinct |
| mhaManda | mha | — | | | 6b · Threatened |
| btmMandailing | btm | Austronesian | | 1.1 m | 6b · Threatened |
| mhqMandan | mhq | Hoka-Sioux | | | 9 · Dormant |
| zmkMandandanyi | zmk | Australian Aboriginal languages | | | 10 · Extinct |
| mdrMandar | mdr | Austronesian | | | 5 · Developing |
| tbfMandara | tbf | Austronesian | | | 4 · Educational |
| mquMandari | mqu | Nilo-Saharan | | | 5 · Developing |
| cmnMandarin Chinese普通话 | cmn | Sino-Tibetan | +4 | 1.07 bn | 1 · National |
| mhtMandawaca | mht | — | | | 10 · Extinct |
| mryMandaya | mry | Austronesian | | | 6a · Vigorous |
| mjlMandeali | mjl | — | | 900,000 | 5 · Developing |
| mqrManderbahasa Mander | mqr | Orya–Tor | | | 8b · Nearly Extinct |
| lemMandi | lem | Niger–Congo | | | 5 · Developing |
| manManding | man | Niger–Congo | +5 | | |
| mnkMandinkaMandinka kaŋo | mnk | Niger–Congo | +7 | 1.4 m | 5 · Developing |
| mfvMandjak | mfv | Niger–Congo | | | 5 · Developing |
| jetManembahasa Jeti | jet | Border | | | 6a · Vigorous |
| zngMang | zng | Austroasiatic | | | 6b · Threatened |
| mpcMangarayi | mpc | Mangarrayi-Maran | | | 9 · Dormant |
| mrvMangareva | mrv | Austronesian | | | 7 · Shifting |
| memMangarla | mem | Australian Aboriginal languages | | | 9 · Dormant |
| znsMangas | zns | Afroasiatic | | | 6b · Threatened |
| myjMangaya | myj | Niger–Congo | | | 8b · Nearly Extinct |
| mcsMangbai | mcs | Niger–Congo | | | 6a · Vigorous |
| mdjMangbetu | mdj | Nilo-Saharan | | | 5 · Developing |
| mdkMangbutu | mdk | — | | | 6a · Vigorous |
| zmeMangerr | zme | — | | | 10 · Extinct |
| mmoMangga Buang | mmo | Austronesian | | | 5 · Developing |
| mqyManggaraibahasa Manggarai | mqy | Austronesian | | 900,000 | 6a · Vigorous |
| mgeMango | mge | Nilo-Saharan | | | 5 · Developing |
| mqcMangole | mqc | — | | | 6a · Vigorous |
| abdManide | abd | Austronesian | | | 6b · Threatened |
| myqManinka | myq | Niger–Congo | +3 | 3.3 m | |
| mqpManipa | mqp | Austronesian | | | 6b · Threatened |
| knfMankanya | knf | Niger–Congo | | | 5 · Developing |
| ngeMankon | nge | Niger–Congo | | | 6a · Vigorous |
| mjuManna-Dora | mju | Dravidian | | 18,964 | 8b · Nearly Extinct |
| mjvMannan | mjv | Dravidian | | | 6b · Threatened |
| mevMano | mev | Niger–Congo | | | 5 · Developing |
| mskMansaka | msk | Austronesian | | 58,000 | 5 · Developing |
| mnsMansi | mns | Uralic | | 938 | 6b · Threatened |
| mygManta | myg | Niger–Congo | | | 6b · Threatened |
| mnxMantionbahasa Mantion | mnx | — | | | 5 · Developing |
| ntyMantsi | nty | Sino-Tibetan | | | 6a · Vigorous |
| whaManusela | wha | Austronesian | | | 6a · Vigorous |
| glvManxGaelg | glv | Indo-European | | 284 | 9 · Reawakening |
| mxcManyika | mxc | Niger–Congo | | | 6a · Vigorous |
| mzvManza | mzv | Niger–Congo | | | 6a · Vigorous |
| nbiMao Naga | nbi | Sino-Tibetan | | | 5 · Developing |
| mmdMaonan | mmd | Kra–Dai | | 30,000 | 6b · Threatened |
| swbMaore | swb | Niger–Congo | | 15,200 | 5 · Developing |
| mriMāorite reo Māori | mri | Austronesian | | 213,849 | 6b · Threatened |
| mlhMape | mlh | Trans–New Guinea | | | 6b · Threatened |
| mpyMapiabahasa Mapia | mpy | Austronesian | | | 10 · Extinct |
| mpwMapidian | mpw | — | | | 8b · Nearly Extinct |
| bzhMapos Buang | bzh | Austronesian | | | 5 · Developing |
| mcgMapoyo | mcg | Cariban | | 12 | Critically endangered |
| arnMapudungunmapudungun | arn | — | | 300,000 | 6b · Threatened |
| sjmMapun | sjm | Austronesian | | | 5 · Developing |
| mrhMara | mrh | Sino-Tibetan | | 400,000 | 4 · Educational |
| vmhMaraghei | vmh | Indo-European | | | 7 · Shifting |
| mrsMaragus | mrs | Austronesian | | | 8b · Nearly Extinct |
| nmaMaram | nma | Sino-Tibetan | | | 4 · Educational |
| mrwMaranaoMeranaw | mrw | Austronesian | | 780,000 | 4 · Educational |
| waxMarangis | wax | Ramu–Lower Sepik | | | 6a · Vigorous |
| marMarathiमराठी | mar | — | | 77 m | 2 · Provincial |
| mvrMaraubahasa Marau | mvr | — | | | 6b · Threatened |
| mpgMarba | mpg | Afroasiatic | | | 5 · Developing |
| mrtMargi | mrt | — | | | 6a · Vigorous |
| hobMari | hob | — | | | 6a · Vigorous |
| mbxMari | mbx | Sepik | | | 6b · Threatened |
| chmMari | chm | Uralic | | 470,000 | Definitely endangered |
| mrrMaria | mrr | Dravidian | | 134,000 | 6a · Vigorous |
| mdsMaria | mds | — | | | 6a · Vigorous |
| mrcMaricopa | mrc | Hoka-Sioux | | 35 | 8a · Moribund |
| zmdMaridan | zmd | Western Daly | | 20 | 9 · Dormant |
| zmjMaridjabin | zmj | Western Daly | | 20 | 8b · Nearly Extinct |
| zmmMarimanindji | zmm | Western Daly | | 15 | 9 · Dormant |
| mrzMarind | mrz | Trans–New Guinea | | 7,000 | 6b · Threatened |
| mbwMaring | mbw | Trans–New Guinea | | | 5 · Developing |
| nngMaring Naga | nng | Sino-Tibetan | | | 5 · Developing |
| zmtMaringarr | zmt | Western Daly | | 8 | 8b · Nearly Extinct |
| nsrMaritime Sign Language | nsr | — | | | 8a · Moribund |
| mspMaritsauá | msp | Tupian | | | 10 · Extinct |
| aytMariveleño | ayt | Austronesian | | | 6b · Threatened |
| zmyMariyedi | zmy | Western Daly | | 20 | 8b · Nearly Extinct |
| rkmMarka | rkm | Niger–Congo | | | 6a · Vigorous |
| enbMarkweta | enb | Nilo-Saharan | | | 5 · Developing |
| rmzMarma | rmz | Sino-Tibetan | | | 3 · Wider Communication |
| mvoMarovo | mvo | Austronesian | | | 5 · Developing |
| mecMarra | mec | Mangarrayi-Maran | | | 8b · Nearly Extinct |
| zmrMarranj | zmr | Australian Aboriginal languages | | 15 | 8b · Nearly Extinct |
| mhgMarrgu | mhg | — | | | 10 · Extinct |
| mfrMarrithiyel | mfr | Western Daly | | 15 | 8b · Nearly Extinct |
| mahMarshalleseKajin M̧ajeļ | mah | Austronesian | | 61,000 | 1 · National |
| zmgMarti Ke | zmg | Western Daly | | 3 | 8b · Nearly Extinct |
| mpjMartu Wangka | mpj | Australian Aboriginal languages | | | Vulnerable |
| vmaMartuthunira | vma | Australian Aboriginal languages | | | 10 · Extinct |
| mzrMarúbo | mzr | Pano-Tacanan | | | 6a · Vigorous |
| mwrMarwariमारवाड़ी | mwr | Indo-European | | 13 m | |
| rwrMarwari | rwr | Indo-European | | 7.9 m | 5 · Developing |
| mveMarwari | mve | Indo-European | | 146,000 | 4 · Educational |
| myxMasaaba | myx | Niger–Congo | | | 5 · Developing |
| tisMasadiit Itneg | tis | Austronesian | | | 6a · Vigorous |
| mlsMasalit | mls | Nilo-Saharan | | | 6a · Vigorous |
| msbMasbateño | msb | Austronesian | | 350,000 | 3 · Wider Communication |
| cujMashco Piro | cuj | Piro | | 60 | 6b · Threatened |
| mhoMashi | mho | Niger–Congo | | | 6b · Threatened |
| jmsMashi | jms | Niger–Congo | | | 6b · Threatened |
| mshMasikoro Malagasy | msh | Austronesian | | | 6a · Vigorous |
| ismMasimasibahasa Masimasi | ism | Austronesian | | | 8b · Nearly Extinct |
| klvMaskelynes | klv | Austronesian | | | 5 · Developing |
| tmfMaskoy | tmf | Mascoian | | | 6b · Threatened |
| msvMaslam | msv | Afroasiatic | | | 8a · Moribund |
| mesMasmaje | mes | Afroasiatic | | | 6a · Vigorous |
| mcnMassa | mcn | Afroasiatic | | | 5 · Developing |
| wamMassachusett | wam | Algic | | 400 | 9 · Reawakening |
| mdgMassalat | mdg | Nilo-Saharan | | | 8b · Nearly Extinct |
| mvsMassepbahasa Massep | mvs | — | | | 8b · Nearly Extinct |
| mtnMatagalpa | mtn | Misumalpan | | | 9 · Dormant |
| mfhMatal | mfh | — | | 18,000 | 5 · Developing |
| xmtMatbatbahasa Matbat | xmt | — | | | 6b · Threatened |
| mgvMatengo | mgv | Niger–Congo | | | 6a · Vigorous |
| mbtMatigsalug | mbt | — | | 50,000 | 5 · Developing |
| mzoMatipuhy | mzo | Cariban | | | 8a · Moribund |
| mpqMatis | mpq | Pano-Tacanan | | 320 | 6a · Vigorous |
| zmlMatngele | zml | Daly | | | 10 · Extinct |
| metMato | met | Austronesian | | | 5 · Developing |
| axgMato Grosso Arára | axg | — | | | 9 · Dormant |
| mtmMator | mtm | Uralic | | | |
| mcfMatsés | mcf | Pano-Tacanan | | 2,200 | 5 · Developing |
| mvbMattole | mvb | Na-Dene | | | 9 · Dormant |
| mgwMatumbi | mgw | Niger–Congo | | | 6a · Vigorous |
| mphMaung | mph | Australian Aboriginal languages | | 371 | 6a · Vigorous |
| mfeMauritian Creole | mfe | French-based creole languages | | 600,000 | 3 · Wider Communication |
| lsyMauritian Sign Language | lsy | — | | | 5 · Developing |
| mhlMauwake | mhl | — | | | 5 · Developing |
| mkvMav̋ea | mkv | Austronesian | | | 7 · Shifting |
| mcwMawa | mcw | Afroasiatic | | | 6a · Vigorous |
| mjjMawak | mjj | Trans–New Guinea | | | 8a · Moribund |
| mczMawan | mcz | Trans–New Guinea | | | 8a · Moribund |
| mzxMawayana | mzx | — | | 2 | 10 · Extinct |
| mkeMawchi | mke | Indo-European | | | 5 · Developing |
| mavMawé | mav | Tupian | | 9,200 | 5 · Developing |
| mgkMawesbahasa Mawes | mgk | — | | | 6b · Threatened |
| mblMaxakalí | mbl | Macro-Jê | | | 5 · Developing |
| symMaya Samo | sym | Niger–Congo | | | 6a · Vigorous |
| ayzMaybrat | ayz | — | | | 5 · Developing |
| xykMayi-Kulan | xyk | Australian Aboriginal languages | | | 10 · Extinct |
| xmyMayi-Kutuna | xmy | Australian Aboriginal languages | | | 10 · Extinct |
| xytMayi-Thakurti | xyt | Australian Aboriginal languages | | | 10 · Extinct |
| xyjMayi-Yapi | xyj | Australian Aboriginal languages | | | 10 · Extinct |
| mfyMayo | mfy | Uto-Aztecan | | 39,000 | 8a · Moribund |
| mdmMayogo | mdm | — | | | 5 · Developing |
| ifuMayoyao | ifu | Austronesian | | | 4 · Educational |
| mazMazahua | maz | Central American Indian languages | | | 5 · Developing |
| mznMazanderaniمازرونی زبون | mzn | Indo-European | | 3.3 m | 5 · Developing |
| vmzMazatlán Mazatec | vmz | — | | | 6a · Vigorous |
| mfcMba | mfc | Niger–Congo | | | 6a · Vigorous |
| vmbMbabaram | vmb | Australian Aboriginal languages | | | 10 · Extinct |
| nbmMbaka | nbm | Niger–Congo | | | 5 · Developing |
| mdpMbala | mdp | Niger–Congo | | | 6a · Vigorous |
| lnbMbalanhu | lnb | Niger–Congo | | 200 | 6b · Threatened |
| mjhMbamba Bay | mjh | Niger–Congo | | | 6b · Threatened |
| mxgMbangala | mxg | Niger–Congo | | | 5 · Developing |
| mgnMbangi | mgn | Niger–Congo | | 2,750 | 6b · Threatened |
| zmnMbangwe | zmn | — | | | 6b · Threatened |
| mpkMbara | mpk | Afroasiatic | | | 8a · Moribund |
| mvlMbara | mvl | Australian Aboriginal languages | | | 10 · Extinct |
| zmvMbariman-Gudhinma | zmv | Australian Aboriginal languages | | | 10 · Extinct |
| bauMbat | bau | Niger–Congo | | 40,000 | 6a · Vigorous |
| mdnMbati | mdn | — | | | 6a · Vigorous |
| gwaMbato | gwa | Niger–Congo | | | 6a · Vigorous |
| mybMbay | myb | Nilo-Saharan | | | 5 · Developing |
| mtkMbe' | mtk | Niger–Congo | | | 6b · Threatened |
| mfoMbe | mfo | Niger–Congo | | | 5 · Developing |
| ttpMbelala | ttp | Austronesian | | | 6b · Threatened |
| mqlMbelime | mql | Niger–Congo | | 24,500 | 5 · Developing |
| mfnMbembe | mfn | Niger–Congo | | | 6a · Vigorous |
| mdtMbere | mdt | Niger–Congo | | | 6a · Vigorous |
| zmsMbesa | zms | Niger–Congo | | | 6a · Vigorous |
| emzMbessa | emz | Niger–Congo | | | |
| bawMbili-Mbui | baw | Niger–Congo | | | 6a · Vigorous |
| mboMbo | mbo | Niger–Congo | | 70,000 | 6b · Threatened |
| zmwMbo | zmw | Niger–Congo | | | 6a · Vigorous |
| xmbMboa | xmb | Niger–Congo | | | 6b · Threatened |
| mdqMbole | mdq | Niger–Congo | | | 6a · Vigorous |
| gaiMbore | gai | Ramu–Lower Sepik | | | 5 · Developing |
| mdwMboshi | mdw | Niger–Congo | | | 6b · Threatened |
| mxoMbowe | mxo | Niger–Congo | | | 6b · Threatened |
| mucMbu’ | muc | Niger–Congo | | | 6b · Threatened |
| mhdMbugu | mhd | Afroasiatic | | | 7 · Shifting |
| mgzMbugwe | mgz | Niger–Congo | | | 6b · Threatened |
| bpcMbuk | bpc | Niger–Congo | | | |
| mqbMbuko | mqb | Afroasiatic | | | 5 · Developing |
| mhwMbukushu | mhw | Niger–Congo | +1 | 49,710 | 6a · Vigorous |
| mnaMbula | mna | Austronesian | | | 4 · Educational |
| mlbMbule | mlb | Niger–Congo | | | 6b · Threatened |
| mbvMbulungish | mbv | Niger–Congo | | | 6a · Vigorous |
| mddMbum | mdd | Niger–Congo | | | 5 · Developing |
| mckMbunda | mck | Niger–Congo | | | 5 · Developing |
| mgyMbunga | mgy | Niger–Congo | | | 6b · Threatened |
| bbtMburku | bbt | — | | 12,000 | 6a · Vigorous |
| mfuMbwela | mfu | Niger–Congo | | | 6a · Vigorous |
| gunMbyá Guaraní | gun | Tupian | | | 5 · Developing |
| mymMe'en | mym | Nilo-Saharan | | | 4 · Educational |
| mhrMeadow MariОлыкмарий йылме | mhr | Uralic | | 482,000 | 4 · Educational |
| fitMeänkielimeänkieli | fit | Uralic | | 70,000 | 8a · Moribund |
| mejMeaxbahasa Meax | mej | West Papuan | | | 5 · Developing |
| txuMẽbêngôkre | txu | Macro-Jê | | 7,100 | 5 · Developing |
| mjmMedebur | mjm | Austronesian | | | 6a · Vigorous |
| mueMedia Lengua | mue | — | | 2,600 | 6b · Threatened |
| xmeMedian | xme | Indo-European | | | |
| mudMedny Aleut | mud | — | | 3 | 8b · Nearly Extinct |
| byvMedumba | byv | Niger–Congo | | | 3 · Wider Communication |
| ruqMegleno-Romanian | ruq | Indo-European | +1 | 5,000 | 6b · Threatened |
| nuxMehek | nux | Sepik | | | 6b · Threatened |
| mmhMehinaku | mmh | Paresi–Waura | | 230 | 6a · Vigorous |
| gdqMehri | gdq | Afroasiatic | | | 7 · Shifting |
| mniMeiteiꯃꯤꯇꯩ ꯂꯣꯟ | mni | Sino-Tibetan | | 1.5 m | 2 · Provincial |
| mekMekeo | mek | Austronesian | | 19,000 | 5 · Developing |
| mvkMekmek | mvk | Yuat | | | 6a · Vigorous |
| mxeMele-Fila | mxe | Austronesian | | 3,500 | 5 · Developing |
| medMelpa | med | Trans–New Guinea | | | 5 · Developing |
| bbyMenchum | bby | — | | | 6b · Threatened |
| xkdMendalam Kayan | xkd | Austronesian | | | 6b · Threatened |
| mfdMendankwe-Nkwen | mfd | Niger–Congo | | | 6b · Threatened |
| menMende | men | Niger–Congo | | | 2 · Provincial |
| meeMengen | mee | Austronesian | | | 6a · Vigorous |
| mctMengisa | mct | — | | | 6b · Threatened |
| meaMenka | mea | Niger–Congo | | | 6a · Vigorous |
| mezMenomineeomǣqnomenēweqnæsewen | mez | Algic | | 35 | 8a · Moribund |
| mwvMentawaibahasa Mentawai | mwv | Austronesian | | | 5 · Developing |
| mvxMeoswarbahasa Meoswar | mvx | Austronesian | | | 6b · Threatened |
| mnuMerbahasa Mer | mnu | — | | | 6b · Threatened |
| mxmMeramera | mxm | Austronesian | | | 6a · Vigorous |
| lmbMerei | lmb | Austronesian | | | 6b · Threatened |
| mnlMerei-Tiale | mnl | Austronesian | | | 6b · Threatened |
| ulkMeriam | ulk | Eastern Trans-Fly | | | 6b · Threatened |
| xmrMeroitic | xmr | Nilo-Saharan | | | |
| merMeru | mer | Niger–Congo | | | 4 · Educational |
| wryMerwari | wry | Indo-European | | 4 m | 6a · Vigorous |
| apmMescalero-ChiricahuaNdee bizaa | apm | Na-Dene | | | 8a · Moribund |
| zimMesme | zim | Afroasiatic | | | 5 · Developing |
| mysMesmes | mys | Afroasiatic | | | 9 · Dormant |
| acmMesopotamian Arabicلهجة عراقية | acm | Afroasiatic | | 15.7 m | 3 · Wider Communication |
| mvzMesqan | mvz | Afroasiatic | | 195,000 | 6a · Vigorous |
| cmsMessapian | cms | Indo-European | | | |
| mgoMeta' | mgo | Niger–Congo | | | 5 · Developing |
| mtrMewari | mtr | Indo-European | | 5 m | 5 · Developing |
| wtmMewati | wtm | Indo-European | | 5 m | 5 · Developing |
| mfsMexican Sign Language | mfs | — | | | 5 · Developing |
| oteMezquital Otomi | ote | Central American Indian languages | | | 5 · Developing |
| zmfMfinu | zmf | Niger–Congo | | | 7 · Shifting |
| nfuMfumte | nfu | Niger–Congo | | | 6a · Vigorous |
| xmgMəgaka | xmg | Niger–Congo | | | 6a · Vigorous |
| gmzMgbo | gmz | — | | | 5 · Developing |
| micMi'kmaq | mic | Algic | | 8,270 | 6b · Threatened |
| zamMiahuatlán Zapotec | zam | Central American Indian languages | | | 6b · Threatened |
| miaMiami-Illinoismyaamia | mia | Algic | | | 9 · Reawakening |
| mptMian | mpt | Trans–New Guinea | | | 5 · Developing |
| plaMiani | pla | Trans–New Guinea | | | 5 · Developing |
| bluMiao | blu | Hmong–Mien | | 4 m | |
| yiqMicha | yiq | Sino-Tibetan | | | 7 · Shifting |
| crgMichif | crg | — | | 730 | 8b · Nearly Extinct |