Codici ISO 639-3 (M-O)
# Codici ISO 639-3 (M-O)

Di seguito la lista completa dei Codici ISO 639-3 (lettere M,N e O)

## Elenco

### M

| Cod. | 639-2 | 639-1 | Dom | Tip | Nome |
| - | - | - | - | - | - |
| maa | | | I | L | San Jerónimo Tecóatl Mazatec |
| mab | | | I | L | Yutanduchi Mixtec |
| mad | mad | | I | L | Madurese |
| mae | | | I | L | Bo-Rukul |
| maf | | | I | L | Mafa |
| mag | mag | | I | L | Magahi |
| mah | mah | mh | I | L | Marshallese |
| mai | mai | | I | L | Maithili |
| maj | | | I | L | Jalapa De Díaz Mazatec |
| mak | mak | | I | L | Makasar |
| mal | mal | ml | I | L | Malayalam |
| mam | | | I | L | Mam |
| man | man | | M | L | Mandingo |
| maq | | | I | L | Chiquihuitlán Mazatec |
| mar | mar | mr | I | L | Marathi |
| mas | mas | | I | L | Masai |
| mat | | | I | L | San Francisco Matlatzinca |
| mau | | | I | L | Huautla Mazatec |
| mav | | | I | L | Sateré-Mawé |
| maw | | | I | L | Mampruli |
| max | | | I | L | North Moluccan Malay |
| maz | | | I | L | Central Mazahua |
| mba | | | I | L | Higaonon |
| mbb | | | I | L | Western Bukidnon Manobo |
| mbc | | | I | L | Macushi |
| mbd | | | I | L | Dibabawon Manobo |
| mbe | | | I | E | Molale |
| mbf | | | I | L | Baba Malay |
| mbh | | | I | L | Mangseng |
| mbi | | | I | L | Ilianen Manobo |
| mbj | | | I | L | Nadëb |
| mbk | | | I | L | Malol |
| mbl | | | I | L | Maxakalí |
| mbm | | | I | L | Ombamba |
| mbn | | | I | L | Macaguán |
| mbo | | | I | L | Mbo (Cameroon) |
| mbp | | | I | L | Malayo |
| mbq | | | I | L | Maisin |
| mbr | | | I | L | Nukak Makú |
| mbs | | | I | L | Sarangani Manobo |
| mbt | | | I | L | Matigsalug Manobo |
| mbu | | | I | L | Mbula-Bwazza |
| mbv | | | I | L | Mbulungish |
| mbw | | | I | L | Maring |
| mbx | | | I | L | Mari (East Sepik Province) |
| mby | | | I | L | Memoni |
| mbz | | | I | L | Amoltepec Mixtec |
| mca | | | I | L | Maca |
| mcb | | | I | L | Machiguenga |
| mcc | | | I | L | Bitur |
| mcd | | | I | L | Sharanahua |
| mce | | | I | L | Itundujia Mixtec |
| mcf | | | I | L | Matsés |
| mcg | | | I | L | Mapoyo |
| mch | | | I | L | Maquiritari |
| mci | | | I | L | Mese |
| mcj | | | I | L | Mvanip |
| mck | | | I | L | Mbunda |
| mcl | | | I | E | Macaguaje |
| mcm | | | I | L | Kristang |
| mcn | | | I | L | Masana |
| mco | | | I | L | Coatlán Mixe |
| mcp | | | I | L | Makaa |
| mcq | | | I | L | Ese |
| mcr | | | I | L | Menya |
| mcs | | | I | L | Mambai |
| mct | | | I | L | Mengisa |
| mcu | | | I | L | Cameroon Mambila |
| mcv | | | I | L | Minanibai |
| mcw | | | I | L | Mawa (Chad) |
| mcx | | | I | L | Mpiemo |
| mcy | | | I | L | South Watut |
| mcz | | | I | L | Mawan |
| mda | | | I | L | Mada (Nigeria) |
| mdb | | | I | L | Morigi |
| mdc | | | I | L | Male (Papua New Guinea) |
| mdd | | | I | L | Mbum |
| mde | | | I | L | Maba (Chad) |
| mdf | mdf | | I | L | Moksha |
| mdg | | | I | L | Massalat |
| mdh | | | I | L | Maguindanao |
| mdi | | | I | L | Mamvu |
| mdj | | | I | L | Mangbetu |
| mdk | | | I | L | Mangbutu |
| mdl | | | I | L | Maltese Sign Language |
| mdm | | | I | L | Mayogo |
| mdn | | | I | L | Mbati |
| mdp | | | I | L | Mbala |
| mdq | | | I | L | Mbole |
| mdr | mdr | | I | L | Mandar |
| mds | | | I | L | Maria (Papua New Guinea) |
| mdt | | | I | L | Mbere |
| mdu | | | I | L | Mboko |
| mdv | | | I | L | Santa Lucía Monteverde Mixtec |
| mdw | | | I | L | Mbosi |
| mdx | | | I | L | Dizin |
| mdy | | | I | L | Male (Ethiopia) |
| mdz | | | I | L | Suruí Do Pará |
| mea | | | I | L | Menka |
| meb | | | I | L | Ikobi-Mena |
| mec | | | I | L | Mara |
| med | | | I | L | Melpa |
| mee | | | I | L | Mengen |
| mef | | | I | L | Megam |
| meg | | | I | L | Mea |
| meh | | | I | L | Southwestern Tlaxiaco Mixtec |
| mei | | | I | L | Midob |
| mej | | | I | L | Meyah |
| mek | | | I | L | Mekeo |
| mel | | | I | L | Melanau |
| mem | | | I | E | Mangala |
| men | men | | I | L | Mende (Sierra Leone) |
| meo | | | I | L | Kedah Malay |
| mep | | | I | L | Miriwung |
| meq | | | I | L | Merey |
| mer | | | I | L | Meru |
| mes | | | I | L | Masmaje |
| met | | | I | L | Mato |
| meu | | | I | L | Motu |
| mev | | | I | L | Mann |
| mew | | | I | L | Maaka |
| mey | | | I | L | Hassaniyya |
| mez | | | I | L | Menominee |
| mfa | | | I | L | Pattani Malay |
| mfb | | | I | L | Lom |
| mfc | | | I | L | Mba |
| mfd | | | I | L | Mendankwe-Nkwen |
| mfe | | | I | L | Morisyen |
| mff | | | I | L | Naki |
| mfg | | | I | L | Mixifore |
| mfh | | | I | L | Matal |
| mfi | | | I | L | Wandala |
| mfj | | | I | L | Mefele |
| mfk | | | I | L | North Mofu |
| mfl | | | I | L | Putai |
| mfm | | | I | L | Marghi South |
| mfn | | | I | L | Cross River Mbembe |
| mfo | | | I | L | Mbe |
| mfp | | | I | L | Makassar Malay |
| mfq | | | I | L | Moba |
| mfr | | | I | L | Marithiel |
| mfs | | | I | L | Mexican Sign Language |
| mft | | | I | L | Mokerang |
| mfu | | | I | L | Mbwela |
| mfv | | | I | L | Mandjak |
| mfw | | | I | E | Mulaha |
| mfx | | | I | L | Melo |
| mfy | | | I | L | Mayo |
| mfz | | | I | L | Mabaan |
| mga | mga | | I | H | Middle Irish (900-1200) |
| mgb | | | I | L | Mararit |
| mgc | | | I | L | Morokodo |
| mgd | | | I | L | Moru |
| mge | | | I | L | Mango |
| mgf | | | I | L | Maklew |
| mgg | | | I | L | Mpongmpong |
| mgh | | | I | L | Makhuwa-Meetto |
| mgi | | | I | L | Lijili |
| mgj | | | I | L | Abureni |
| mgk | | | I | L | Mawes |
| mgl | | | I | L | Maleu-Kilenge |
| mgm | | | I | L | Mambae |
| mgn | | | I | L | Mbangi |
| mgo | | | I | L | Meta' |
| mgp | | | I | L | Eastern Magar |
| mgq | | | I | L | Malila |
| mgr | | | I | L | Mambwe-Lungu |
| mgs | | | I | L | Manda (Tanzania) |
| mgt | | | I | L | Mongol |
| mgu | | | I | L | Mailu |
| mgv | | | I | L | Matengo |
| mgw | | | I | L | Matumbi |
| mgy | | | I | L | Mbunga |
| mgz | | | I | L | Mbugwe |
| mha | | | I | L | Manda (India) |
| mhb | | | I | L | Mahongwe |
| mhc | | | I | L | Mocho |
| mhd | | | I | L | Mbugu |
| mhe | | | I | L | Besisi |
| mhf | | | I | L | Mamaa |
| mhg | | | I | L | Margu |
| mhh | | | I | L | Maskoy Pidgin |
| mhi | | | I | L | Ma'di |
| mhj | | | I | L | Mogholi |
| mhk | | | I | L | Mungaka |
| mhl | | | I | L | Mauwake |
| mhm | | | I | L | Makhuwa-Moniga |
| mhn | | | I | L | Mócheno |
| mho | | | I | L | Mashi (Zambia) |
| mhp | | | I | L | Balinese Malay |
| mhq | | | I | L | Mandan |
| mhr | | | I | L | Eastern Mari |
| mhs | | | I | L | Buru (Indonesia) |
| mht | | | I | L | Mandahuaca |
| mhu | | | I | L | Digaro-Mishmi; Darang Deng |
| mhw | | | I | L | Mbukushu |
| mhx | | | I | L | Maru |
| mhy | | | I | L | Ma'anyan |
| mhz | | | I | L | Mor (Mor Islands) |
| mia | | | I | E | Miami |
| mib | | | I | L | Atatláhuca Mixtec |
| mic | mic | | I | L | Mi'kmaq |
| mid | | | I | L | Mandaic |
| mie | | | I | L | Ocotepec Mixtec |
| mif | | | I | L | Mofu-Gudur |
| mig | | | I | L | San Miguel El Grande Mixtec |
| mih | | | I | L | Chayuco Mixtec |
| mii | | | I | L | Chigmecatitlán Mixtec |
| mij | | | I | L | Abar |
| mik | | | I | L | Mikasuki |
| mil | | | I | L | Peñoles Mixtec |
| mim | | | I | L | Alacatlatzala Mixtec |
| min | min | | I | L | Minangkabau |
| mio | | | I | L | Pinotepa Nacional Mixtec |
| mip | | | I | L | Apasco-Apoala Mixtec |
| miq | | | I | L | Mískito |
| mir | | | I | L | Isthmus Mixe |
| mit | | | I | L | Southern Puebla Mixtec |
| miu | | | I | L | Cacaloxtepec Mixtec |
| miw | | | I | L | Akoye |
| mix | | | I | L | Mixtepec Mixtec |
| miy | | | I | L | Ayutla Mixtec |
| miz | | | I | L | Coatzospan Mixtec |
| mjc | | | I | L | San Juan Colorado Mixtec |
| mjd | | | I | L | Northwest Maidu |
| mje | | | I | E | Muskum |
| mjg | | | I | L | Tu |
| mjh | | | I | L | Mwera (Nyasa) |
| mji | | | I | L | Kim Mun |
| mjj | | | I | L | Mawak |
| mjk | | | I | L | Matukar |
| mjl | | | I | L | Mandeali |
| mjm | | | I | L | Medebur |
| mjn | | | I | L | Ma (Papua New Guinea) |
| mjo | | | I | L | Malankuravan |
| mjp | | | I | L | Malapandaram |
| mjq | | | I | L | Malaryan |
| mjr | | | I | L | Malavedan |
| mjs | | | I | L | Miship |
| mjt | | | I | L | Sauria Paharia |
| mju | | | I | L | Manna-Dora |
| mjv | | | I | L | Mannan |
| mjw | | | I | L | Karbi |
| mjx | | | I | L | Mahali |
| mjy | | | I | E | Mahican |
| mjz | | | I | L | Majhi |
| mka | | | I | L | Mbre |
| mkb | | | I | L | Mal Paharia |
| mkc | | | I | L | Siliput |
| mkd | mac/mkd | mk | I | L | Macedonian |
| mke | | | I | L | Mawchi |
| mkf | | | I | L | Miya |
| mkg | | | I | L | Mak (China) |
| mki | | | I | L | Dhatki |
| mkj | | | I | L | Mokilese |
| mkk | | | I | L | Byep |
| mkl | | | I | L | Mokole |
| mkm | | | I | L | Moklen |
| mkn | | | I | L | Kupang Malay |
| mko | | | I | L | Mingang Doso |
| mkp | | | I | L | Moikodi |
| mkq | | | I | E | Bay Miwok |
| mkr | | | I | L | Malas |
| mks | | | I | L | Silacayoapan Mixtec |
| mkt | | | I | L | Vamale |
| mku | | | I | L | Konyanka Maninka |
| mkv | | | I | L | Mafea |
| mkw | | | I | L | Kituba (Congo) |
| mkx | | | I | L | Cinamiguin Manobo |
| mky | | | I | L | East Makian |
| mkz | | | I | L | Makasae |
| mla | | | I | L | Malo |
| mlb | | | I | L | Mbule |
| mlc | | | I | L | Cao Lan |
| mld | | | I | L | Malakhel |
| mle | | | I | L | Manambu |
| mlf | | | I | L | Mal |
| mlg | mlg | mg | M | L | Malagasy |
| mlh | | | I | L | Mape |
| mli | | | I | L | Malimpung |
| mlj | | | I | L | Miltu |
| mlk | | | I | L | Malakote |
| mll | | | I | L | Malua Bay |
| mlm | | | I | L | Mulam |
| mln | | | I | L | Malango |
| mlo | | | I | L | Mlomp |
| mlp | | | I | L | Bargam |
| mlq | | | I | L | Western Maninkakan |
| mlr | | | I | L | Vame |
| mls | | | I | L | Masalit |
| mlt | mlt | mt | I | L | Maltese |
| mlu | | | I | L | To'abaita |
| mlv | | | I | L | Motlav |
| mlw | | | I | L | Moloko |
| mlx | | | I | L | Malfaxal |
| mlz | | | I | L | Malaynon |
| mma | | | I | L | Mama |
| mmb | | | I | L | Momina |
| mmc | | | I | L | Michoacán Mazahua |
| mmd | | | I | L | Maonan |
| mme | | | I | L | Mae |
| mmf | | | I | L | Mundat |
| mmg | | | I | L | North Ambrym |
| mmh | | | I | L | Mehináku |
| mmi | | | I | L | Musar |
| mmj | | | I | L | Majhwar |
| mmk | | | I | L | Mukha-Dora |
| mml | | | I | L | Man Met |
| mmm | | | I | L | Maii |
| mmn | | | I | L | Mamanwa |
| mmo | | | I | L | Mangga Buang |
| mmp | | | I | L | Siawi |
| mmq | | | I | L | Musak |
| mmr | | | I | L | Western Xiangxi Miao |
| mmt | | | I | L | Malalamai |
| mmu | | | I | L | Mmaala |
| mmv | | | I | E | Miriti |
| mmw | | | I | L | Emae |
| mmx | | | I | L | Madak |
| mmy | | | I | L | Migaama |
| mmz | | | I | L | Mabaale |
| mna | | | I | L | Mbula |
| mnb | | | I | L | Muna |
| mnc | mnc | | I | L | Manchu |
| mnd | | | I | L | Mondé |
| mne | | | I | L | Naba |
| mnf | | | I | L | Mundani |
| mng | | | I | L | Eastern Mnong |
| mnh | | | I | L | Mono (Democratic Republic of Congo) |
| mni | mni | | I | L | Manipuri |
| mnj | | | I | L | Munji |
| mnk | | | I | L | Mandinka |
| mnl | | | I | L | Tiale |
| mnm | | | I | L | Mapena |
| mnn | | | I | L | Southern Mnong |
| mnp | | | I | L | Min Bei Chinese |
| mnq | | | I | L | Minriq |
| mnr | | | I | L | Mono (USA) |
| mns | | | I | L | Mansi |
| mnt | | | I | E | Maykulan |
| mnu | | | I | L | Mer |
| mnv | | | I | L | Rennell-Bellona |
| mnw | | | I | L | Mon |
| mnx | | | I | L | Manikion |
| mny | | | I | L | Manyawa |
| mnz | | | I | L | Moni |
| moa | | | I | L | Mwan |
| moc | | | I | L | Mocoví |
| mod | | | I | E | Mobilian |
| moe | | | I | L | Montagnais |
| mog | | | I | L | Mongondow |
| moh | moh | | I | L | Mohawk |
| moi | | | I | L | Mboi |
| moj | | | I | L | Monzombo |
| mok | | | I | L | Morori |
| mom | | | I | E | Mangue |
| mon | mon | mn | M | L | Mongolian |
| moo | | | I | L | Monom |
| mop | | | I | L | Mopán Maya |
| moq | | | I | L | Mor (Bomberai Peninsula) |
| mor | | | I | L | Moro |
| mos | mos | | I | L | Mossi |
| mot | | | I | L | Barí |
| mou | | | I | L | Mogum |
| mov | | | I | L | Mohave |
| mow | | | I | L | Moi (Congo) |
| mox | | | I | L | Molima |
| moy | | | I | L | Shekkacho |
| moz | | | I | L | Mukulu |
| mpa | | | I | L | Mpoto |
| mpb | | | I | L | Mullukmulluk |
| mpc | | | I | L | Mangarayi |
| mpd | | | I | L | Machinere |
| mpe | | | I | L | Majang |
| mpf | | | I | L | Tajumulco Mam |
| mpg | | | I | L | Marba |
| mph | | | I | L | Maung |
| mpi | | | I | L | Mpade |
| mpj | | | I | L | Martu Wangka |
| mpk | | | I | L | Mbara (Chad) |
| mpl | | | I | L | Middle Watut |
| mpm | | | I | L | Yosondúa Mixtec |
| mpn | | | I | L | Mindiri |
| mpo | | | I | L | Miu |
| mpp | | | I | L | Migabac |
| mpq | | | I | L | Matís |
| mpr | | | I | L | Vangunu |
| mps | | | I | L | Dadibi |
| mpt | | | I | L | Mian |
| mpu | | | I | L | Makuráp |
| mpv | | | I | L | Munkip |
| mpw | | | I | L | Mapidian |
| | | I | L | Misima-Paneati |
| mpy | | | I | L | Mapia |
| mpz | | | I | L | Mpi |
| mqa | | | I | L | Maba (Indonesia) |
| mqb | | | I | L | Mbuko |
| mqc | | | I | L | Mangole |
| mqd | | | I | L | Madang |
| mqe | | | I | L | Matepi |
| mqf | | | I | L | Momuna |
| mqg | | | I | L | Kota Bangun Kutai Malay |
| mqh | | | I | L | Tlazoyaltepec Mixtec |
| mqi | | | I | L | Mariri |
| mqj | | | I | L | Mamasa |
| mqk | | | I | L | Rajah Kabunsuwan Manobo |
| mql | | | I | L | Mbelime |
| mqm | | | I | L | South Marquesan |
| mqn | | | I | L | Moronene |
| mqo | | | I | L | Modole |
| mqp | | | I | L | Manipa |
| mqq | | | I | L | Minokok |
| mqr | | | I | L | Mander |
| mqs | | | I | L | West Makian |
| mqt | | | I | L | Mok |
| mqu | | | I | L | Mandari |
| mqv | | | I | L | Mosimo |
| mqw | | | I | L | Murupi |
| mqx | | | I | L | Mamuju |
| mqy | | | I | L | Manggarai |
| mqz | | | I | L | Malasanga |
| mra | | | I | L | Mlabri |
| mrb | | | I | L | Marino |
| mrc | | | I | L | Maricopa |
| mrd | | | I | L | Western Magar |
| mre | | | I | E | Martha's Vineyard Sign Language |
| mrf | | | I | L | Elseng |
| mrg | | | I | L | Mising |
| mrh | | | I | L | Mara Chin |
| mri | mao/mri | mi | I | L | Maori |
| mrj | | | I | L | Western Mari |
| mrk | | | I | L | Hmwaveke |
| mrl | | | I | L | Mortlockese |
| mrm | | | I | L | Merlav |
| mrn | | | I | L | Cheke Holo |
| mro | | | I | L | Mru |
| mrp | | | I | L | Morouas |
| mrq | | | I | L | North Marquesan |
| mrr | | | I | L | Maria (India) |
| mrs | | | I | L | Maragus |
| mrt | | | I | L | Marghi Central |
| mru | | | I | L | Mono (Cameroon) |
| mrv | | | I | L | Mangareva |
| mrw | | | I | L | Maranao |
| mrx | | | I | L | Maremgi |
| mry | | | I | L | Mandaya |
| mrz | | | I | L | Marind |
| msa | may/msa | ms | M | L | Malay (generic) |
| msb | | | I | L | Masbatenyo |
| msc | | | I | L | Sankaran Maninka |
| msd | | | I | L | Yucatec Maya Sign Language |
| mse | | | I | L | Musey |
| msf | | | I | L | Mekwei |
| msg | | | I | L | Moraid |
| msh | | | I | L | Masikoro Malagasy |
| msi | | | I | L | Sabah Malay |
| msj | | | I | L | Ma (Democratic Republic of Congo) |
| msk | | | I | L | Mansaka |
| msl | | | I | L | Molof |
| msm | | | I | L | Agusan Manobo |
| msn | | | I | L | Mosina |
| mso | | | I | L | Mombum |
| msp | | | I | E | Maritsauá |
| msq | | | I | L | Caac |
| msr | | | I | L | Mongolian Sign Language |
| mss | | | I | L | West Masela |
| msu | | | I | L | Musom |
| msv | | | I | L | Maslam |
| msw | | | I | L | Mansoanka |
| msx | | | I | L | Moresada |
| msy | | | I | L | Aruamu |
| msz | | | I | L | Momare |
| mta | | | I | L | Cotabato Manobo |
| mtb | | | I | L | Anyin Morofo |
| mtc | | | I | L | Munit |
| mtd | | | I | L | Mualang |
| mte | | | I | L | Mono (Solomon Islands) |
| mtf | | | I | L | Murik |
| mtg | | | I | L | Una |
| mth | | | I | L | Munggui |
| mti | | | I | L | Maiwa (Papua New Guinea) |
| mtj | | | I | L | Moskona |
| mtk | | | I | L | Mbe' |
| mtl | | | I | L | Montol |
| mtm | | | I | E | Mator |
| mtn | | | I | E | Matagalpa |
| mto | | | I | L | Totontepec Mixe |
| mtp | | | I | L | Wichí Lhamtés Nocten |
| mtq | | | I | L | Muong |
| mtr | | | I | L | Mewari |
| mts | | | I | L | Yora |
| mtt | | | I | L | Mota |
| mtu | | | I | L | Tututepec Mixtec |
| mtv | | | I | L | Asaro'o |
| mtw | | | I | L | Southern Binukidnon |
| mtx | | | I | L | Tidaá Mixtec |
| mty | | | I | L | Nabi |
| mua | | | I | L | Mundang |
| mub | | | I | L | Mubi |
| muc | | | I | L | Mbu' |
| mud | | | I | L | Mednyj Aleut |
| mue | | | I | L | Media Lengua |
| mug | | | I | L | Musgu |
| muh | | | I | L | Mündü |
| mui | | | I | L | Musi |
| muj | | | I | L | Mabire |
| muk | | | I | L | Mugom |
| mul | mul | | S | S | Multiple languages |
| mum | | | I | L | Maiwala |
| muo | | | I | L | Nyong |
| mup | | | I | L | Malvi |
| muq | | | I | L | Eastern Xiangxi Miao |
| mur | | | I | L | Murle |
| mus | mus | | I | L | Creek |
| mut | | | I | L | Western Muria |
| muu | | | I | L | Yaaku |
| muv | | | I | L | Muthuvan |
| mux | | | I | L | Mbo-Ung |
| muy | | | I | L | Muyang |
| muz | | | I | L | Mursi |
| mva | | | I | L | Manam |
| mvb | | | I | E | Mattole |
| mvd | | | I | L | Mamboru |
| mve | | | I | L | Marwari (Pakistan) |
| mvf | | | I | L | Peripheral Mongolian |
| mvg | | | I | L | Yucuañe Mixtec |
| mvh | | | I | L | Mire |
| mvi | | | I | L | Miyako |
| mvk | | | I | L | Mekmek |
| mvl | | | I | E | Mbara (Australia) |
| mvm | | | I | L | Muya |
| mvn | | | I | L | Minaveha |
| mvo | | | I | L | Marovo |
| mvp | | | I | L | Duri |
| mvq | | | I | L | Moere |
| mvr | | | I | L | Marau |
| mvs | | | I | L | Massep |
| mvt | | | I | L | Mpotovoro |
| mvu | | | I | L | Marfa |
| mvv | | | I | L | Tagal Murut |
| mvw | | | I | L | Machinga |
| mvx | | | I | L | Meoswar |
| mvy | | | I | L | Indus Kohistani |
| mvz | | | I | L | Mesqan |
| mwa | | | I | L | Mwatebu |
| mwb | | | I | L | Juwal |
| mwc | | | I | L | Are |
| mwd | | | I | L | Mudbura |
| mwe | | | I | L | Mwera (Chimwera) |
| mwf | | | I | L | Murrinh-Patha |
| mwg | | | I | L | Aiklep |
| mwh | | | I | L | Mouk-Aria |
| mwi | | | I | L | Labo |
| mwj | | | I | L | Maligo |
| mwk | | | I | L | Kita Maninkakan |
| mwl | mwl | | I | L | Mirandese |
| mwm | | | I | L | Sar |
| mwn | | | I | L | Nyamwanga |
| mwo | | | I | L | Central Maewo |
| mwp | | | I | L | Kala Lagaw Ya |
| mwq | | | I | L | Mün Chin |
| mwr | mwr | | M | L | Marwari |
| mws | | | I | L | Mwimbi-Muthambi |
| mwt | | | I | L | Moken |
| mwu | | | I | E | Mittu |
| mwv | | | I | L | Mentawai |
| mww | | | I | L | Hmong Daw |
| mwx | | | I | L | Mediak |
| mwy | | | I | L | Mosiro |
| mwz | | | I | L | Moingi |
| mxa | | | I | L | Northwest Oaxaca Mixtec |
| mxb | | | I | L | Tezoatlán Mixtec |
| mxc | | | I | L | Manyika |
| mxd | | | I | L | Modang |
| mxe | | | I | L | Mele-Fila |
| mxf | | | I | L | Malgbe |
| mxg | | | I | L | Mbangala |
| mxh | | | I | L | Mvuba |
| mxi | | | I | E | Mozarabic |
| mxj | | | I | L | Miju-Mishmi; Geman Deng |
| mxk | | | I | L | Monumbo |
| mxl | | | I | L | Maxi Gbe |
| mxm | | | I | L | Meramera |
| mxn | | | I | L | Moi (Indonesia) |
| mxo | | | I | L | Mbowe |
| mxp | | | I | L | Tlahuitoltepec Mixe |
| mxq | | | I | L | Juquila Mixe |
| mxr | | | I | L | Murik Kayan |
| mxs | | | I | L | Huitepec Mixtec |
| mxt | | | I | L | Jamiltepec Mixtec |
| mxu | | | I | L | Mada (Cameroon) |
| mxv | | | I | L | Metlatónoc Mixtec |
| mxw | | | I | L | Namo |
| mxx | | | I | L | Mahou |
| mxy | | | I | L | Southeastern Nochixtlán Mixtec |
| mxz | | | I | L | Central Masela |
| mya | bur/mya | my | I | L | Burmese |
| myb | | | I | L | Mbay |
| myc | | | I | L | Mayeka |
| myd | | | I | L | Maramba |
| mye | | | I | L | Myene |
| myf | | | I | L | Bambassi |
| myg | | | I | L | Manta |
| myh | | | I | E | Makah |
| myi | | | I | L | Mina (India) |
| myj | | | I | L | Mangayat |
| myk | | | I | L | Mamara Senoufo |
| myl | | | I | L | Moma |
| mym | | | I | L | Me'en |
| myo | | | I | L | Anfillo |
| myp | | | I | L | Pirahã |
| myq | | | I | L | Forest Maninka |
| myr | | | I | L | Muniche |
| mys | | | I | E | Mesmes |
| myu | | | I | L | Mundurukú |
| myv | myv | | I | L | Erzya |
| myw | | | I | L | Muyuw |
| myx | | | I | L | Masaba |
| myy | | | I | L | Macuna |
| myz | | | I | H | Classical Mandaic |
| mza | | | I | L | Santa María Zacatepec Mixtec |
| mzb | | | I | L | Tumzabt |
| mzc | | | I | L | Madagascar Sign Language |
| mzd | | | I | L | Malimba |
| mze | | | I | L | Morawa |
| mzg | | | I | L | Monastic Sign Language |
| mzh | | | I | L | Wichí Lhamtés Güisnay |
| mzi | | | I | L | Ixcatlán Mazatec |
| mzj | | | I | L | Manya |
| mzk | | | I | L | Nigeria Mambila |
| mzl | | | I | L | Mazatlán Mixe |
| mzm | | | I | L | Mumuye |
| mzn | | | I | L | Mazanderani |
| mzo | | | I | E | Matipuhy |
| mzp | | | I | L | Movima |
| mzq | | | I | L | Mori Atas |
| mzr | | | I | L | Marúbo |
| mzs | | | I | L | Macanese |
| mzt | | | I | L | Mintil |
| mzu | | | I | L | Inapang |
| mzv | | | I | L | Manza |
| mzw | | | I | L | Deg |
| mzx | | | I | L | Mawayana |
| mzy | | | I | L | Mozambican Sign Language |
| mzz | | | I | L | Maiadomu |

Codici ritirati

| 639-3 | Nome | Motivo del ritiro |
| - | - | - |
| mbg | Northern Nambikuára | Suddiviso in Alapmunte (apv), Lakondê (lkd), Latundê (ltn), Mamaindé (wmd), Tawandê (xtw), Yalakalore (xyl) |
| mdo | Southwest Gbaya | Suddiviso in Gbaya-Mbodomo (gmm) e Southwest Gbaya (gso) |
| mgx | Omati | Suddiviso in Barikewa (jbk) e Mouwase (jmw) |
| mhv | Arakanese | Suddiviso in Marma (rmz) e Rakhine (rki) |
| miv | Mimi | Unito ad Amdang (amj) |
| mja | Mahei | Lingua inesistente |
| mly | Malay (individual language) | Suddiviso in Haji (hji), Malay (individual language) (zlm), Papuan Malay (pmy) e Standard Malay (zsm) |
| mms | Southern Mam | Unito a Mam (mam) |
| mob | Moinba | Suddiviso in Chug (cvg), Lish (lsh), Kalaktang Monpa (kkf), Sartang (onp), Tawang Monpa (twm) |
| mof | Mohegan-Montauk-Narragansett | Suddiviso in Mohegan-Pequot (xpq) e Narragansett (xnt) |
| mol | Moldavian | Unito a Romanian (ron e rum 639-2/B) |
| mpf | Tajumulco Mam | Unito a Mam (mam) |
| mqd | Madang | Unito a Mainstream Kenyah (xkl) |
| mst | Cataelano Mandaya | Unito a Mandaya (mry) |
| mtz | Tacanec | Unito a Mam (mam) |
| muw | Mundari | Suddiviso in Munda (unx) e Mundari (unr) |
| mvc | Central Mam | Unito a Mam (mam) |
| mvj | Todos Santos Cuchumatán Mam | Unito a Mam (mam) |
| myt | Sangab Mandaya | Unito a Mandaya (mry) |
| mzf | Aiku | Suddiviso in Ambrak (aag), Yangum Dey (yde), Yangum Gel (ygl), Yangum Mon (ymo) |

### N

| Cod. | 639-2 | 639-1 | Dom | Tip | Nome |
| - | - | - | - | - | - |
| nab | | | I | L | Southern Nambikuára |
| nac | | | I | L | Narak |
| nad | | | I | L | Nijadali |
| nae | | | I | L | Naka'ela |
| naf | | | I | L | Nabak |
| nag | | | I | L | Naga Pidgin |
| naj | | | I | L | Nalu |
| nak | | | I | L | Nakanai |
| nal | | | I | L | Nalik |
| nam | | | I | L | Nangikurrunggurr |
| nan | | | I | L | Min Nan Chinese |
| nao | | | I | L | Naaba |
| nap | nap | | I | L | Neapolitan (napulitano) |
| naq | | | I | L | Nama (Namibia) |
| nar | | | I | L | Iguta |
| nas | | | I | L | Naasioi |
| nat | | | I | L | Hungworo |
| nau | nau | na | I | L | Nauru |
| nav | nav | nv | I | L | Navajo |
| naw | | | I | L | Nawuri |
| nax | | | I | L | Nakwi |
| nay | | | I | E | Narrinyeri |
| naz | | | I | L | Coatepec Nahuatl |
| nba | | | I | L | Nyemba |
| nbb | | | I | L | Ndoe |
| nbc | | | I | L | Chang Naga |
| nbd | | | I | L | Ngbinda |
| nbe | | | I | L | Konyak Naga |
| nbg | | | I | L | Nagarchal |
| nbh | | | I | L | Ngamo |
| nbi | | | I | L | Mao Naga |
| nbj | | | I | L | Ngarinman |
| nbk | | | I | L | Nake |
| nbl | nbl | nr | I | L | South Ndebele |
| nbm | | | I | L | Ngbaka Ma'bo |
| nbn | | | I | L | Kuri |
| nbo | | | I | L | Nkukoli |
| nbp | | | I | L | Nnam |
| nbq | | | I | L | Nggem |
| nbr | | | I | L | Numana-Nunku-Gbantu-Numbu |
| nbs | | | I | L | Namibian Sign Language |
| nbt | | | I | L | Na |
| nbu | | | I | L | Rongmei Naga |
| nbv | | | I | L | Ngamambo |
| nbw | | | I | L | Southern Ngbandi |
| nbx | | | I | L | Ngura |
| nby | | | I | L | Ningera |
| nca | | | I | L | Iyo |
| ncb | | | I | L | Central Nicobarese |
| ncc | | | I | L | Ponam |
| ncd | | | I | L | Nachering |
| nce | | | I | L | Yale |
| ncf | | | I | L | Notsi |
| ncg | | | I | L | Nisga'a |
| nch | | | I | L | Central Huasteca Nahuatl |
| nci | | | I | H | Classical Nahuatl |
| ncj | | | I | L | Northern Puebla Nahuatl |
| nck | | | I | L | Nakara |
| ncl | | | I | L | Michoacán Nahuatl |
| ncm | | | I | L | Nambo |
| ncn | | | I | L | Nauna |
| nco | | | I | L | Sibe |
| ncp | | | I | L | Ndaktup |
| ncr | | | I | L | Ncane |
| ncs | | | I | L | Nicaraguan Sign Language |
| nct | | | I | L | Chothe Naga |
| ncu | | | I | L | Chumburung |
| ncx | | | I | L | Central Puebla Nahuatl |
| ncz | | | I | E | Natchez |
| nda | | | I | L | Ndasa |
| ndb | | | I | L | Kenswei Nsei |
| ndc | | | I | L | Ndau |
| ndd | | | I | L | Nde-Nsele-Nta |
| nde | nde | nd | I | L | North Ndebele |
| ndf | | | I | E | Nadruvian |
| ndg | | | I | L | Ndengereko |
| ndh | | | I | L | Ndali |
| ndi | | | I | L | Samba Leko |
| ndj | | | I | L | Ndamba |
| ndk | | | I | L | Ndaka |
| ndl | | | I | L | Ndolo |
| ndm | | | I | L | Ndam |
| ndn | | | I | L | Ngundi |
| ndo | ndo | ng | I | L | Ndonga |
| ndp | | | I | L | Ndo |
| ndq | | | I | L | Ndombe |
| ndr | | | I | L | Ndoola |
| nds | nds | | I | L | Low German |
| ndt | | | I | L | Ndunga |
| ndu | | | I | L | Dugun |
| ndv | | | I | L | Ndut |
| ndw | | | I | L | Ndobo |
| ndx | | | I | L | Nduga |
| ndy | | | I | L | Lutos |
| ndz | | | I | L | Ndogo |
| nea | | | I | L | Eastern Ngad'a |
| neb | | | I | L | Toura (Côte d'Ivoire) |
| nec | | | I | L | Nedebang |
| ned | | | I | L | Nde-Gbite |
| nee | | | I | L | Kumak |
| nef | | | I | L | Nefamese |
| neg | | | I | L | Negidal |
| neh | | | I | L | Nyenkha |
| nei | | | I | A | Neo-Hittite |
| nej | | | I | L | Neko |
| nek | | | I | L | Neku |
| nem | | | I | L | Nemi |
| nen | | | I | L | Nengone |
| neo | | | I | L | Ná-Meo |
| nep | nep | ne | I | L | Nepali |
| neq | | | I | L | North Central Mixe |
| ner | | | I | L | Yahadian |
| nes | | | I | L | Bhoti Kinnauri |
| net | | | I | L | Nete |
| nev | | | I | L | Nyaheun |
| new | new | | I | L | Newari |
| nex | | | I | L | Neme |
| ney | | | I | L | Neyo |
| nez | | | I | L | Nez Perce |
| nfa | | | I | L | Dhao |
| nfd | | | I | L | Ahwai |
| nfl | | | I | L | Ayiwo |
| nfr | | | I | L | Nafaanra |
| nfu | | | I | L | Mfumte |
| nga | | | I | L | Ngbaka |
| ngb | | | I | L | Northern Ngbandi |
| ngc | | | I | L | Ngombe (Democratic Republic of Congo) |
| ngd | | | I | L | Ngando (Central African Republic) |
| nge | | | I | L | Ngemba |
| ngg | | | I | L | Ngbaka Manza |
| ngh | | | I | L | N/u |
| ngi | | | I | L | Ngizim |
| ngj | | | I | L | Ngie |
| ngk | | | I | L | Ngalkbun |
| ngl | | | I | L | Lomwe |
| ngm | | | I | L | Ngatik Men's Creole |
| ngn | | | I | L | Ngwo |
| ngo | | | I | L | Ngoni |
| ngp | | | I | L | Ngulu |
| ngq | | | I | L | Ngurimi |
| ngr | | | I | L | Nanggu |
| ngs | | | I | L | Gvoko |
| ngt | | | I | L | Ngeq |
| ngu | | | I | L | Guerrero Nahuatl |
| ngv | | | I | E | Nagumi |
| ngw | | | I | L | Ngwaba |
| ngx | | | I | L | Nggwahyi |
| ngy | | | I | L | Tibea |
| ngz | | | I | L | Ngungwel |
| nha | | | I | L | Nhanda |
| nhb | | | I | L | Beng |
| nhc | | | I | E | Tabasco Nahuatl |
| nhd | | | I | L | Ava Guaraní/Chiripá |
| nhe | | | I | L | Eastern Huasteca Nahuatl |
| nhf | | | I | L | Nhuwala |
| nhg | | | I | L | Tetelcingo Nahuatl |
| nhh | | | I | L | Nahari |
| nhi | | | I | L | Zacatlán-Ahuacatlán-Tepetzintla Nahuatl |
| nhk | | | I | L | Isthmus-Cosoleacaque Nahuatl |
| nhm | | | I | L | Morelos Nahuatl |
| nhn | | | I | L | Central Nahuatl |
| nho | | | I | L | Takuu |
| nhp | | | I | L | Isthmus-Pajapan Nahuatl |
| nhq | | | I | L | Huaxcaleca Nahuatl |
| nhr | | | I | L | Naro |
| nht | | | I | L | Ometepec Nahuatl |
| nhu | | | I | L | Noone |
| nhv | | | I | L | Temascaltepec Nahuatl |
| nhw | | | I | L | Western Huasteca Nahuatl |
| nhx | | | I | L | Isthmus-Mecayapan Nahuatl |
| nhy | | | I | L | Northern Oaxaca Nahuatl |
| nhz | | | I | L | Santa María La Alta Nahuatl |
| nia | nia | | I | L | Nias |
| nib | | | I | L | Nakama |
| nid | | | I | E | Ngandi |
| nie | | | I | L | Niellim |
| nif | | | I | L | Nek |
| nig | | | I | E | Ngalakan |
| nih | | | I | L | Nyiha |
| nii | | | I | L | Nii |
| nij | | | I | L | Ngaju |
| nik | | | I | L | Southern Nicobarese |
| nil | | | I | L | Nila |
| nim | | | I | L | Nilamba |
| nin | | | I | L | Ninzo |
| nio | | | I | L | Nganasan |
| nir | | | I | L | Nimboran |
| nis | | | I | L | Nimi |
| nit | | | I | L | Southeastern Kolami |
| niu | niu | | I | L | Niuean |
| niv | | | I | L | Gilyak |
| niw | | | I | L | Nimo |
| nix | | | I | L | Hema |
| niy | | | I | L | Ngiti |
| niz | | | I | L | Ningil |
| nja | | | I | L | Nzanyi |
| njb | | | I | L | Nocte Naga |
| njd | | | I | L | Ndonde Hamba |
| njh | | | I | L | Lotha Naga |
| nji | | | I | L | Gudanji |
| njj | | | I | L | Njen |
| njl | | | I | L | Njalgulgule |
| njm | | | I | L | Angami Naga |
| njn | | | I | L | Liangmai Naga |
| njo | | | I | L | Ao Naga |
| njr | | | I | L | Njerep |
| njs | | | I | L | Nisa |
| njt | | | I | L | Ndyuka-Trio Pidgin |
| nju | | | I | L | Ngadjunmaya |
| njx | | | I | L | Kunyi |
| njy | | | I | L | Njyem |
| njz | | | I | L | Nyishi |
| nka | | | I | L | Nkoya |
| nkb | | | I | L | Khoibu Naga |
| nkc | | | I | L | Nkongho |
| nkd | | | I | L | Koireng |
| nke | | | I | L | Duke |
| nkf | | | I | L | Inpui Naga |
| nkg | | | I | L | Nekgini |
| nkh | | | I | L | Khezha Naga |
| nki | | | I | L | Thangal Naga |
| nkj | | | I | L | Nakai |
| nkk | | | I | L | Nokuku |
| nkm | | | I | L | Namat |
| nkn | | | I | L | Nkangala |
| nko | | | I | L | Nkonya |
| nkp | | | I | E | Niuatoputapu |
| nkr | | | I | L | Nukuoro |
| nks | | | I | L | North Asmat |
| nku | | | I | L | Bouna Kulango |
| nkw | | | I | L | Nkutu |
| nkx | | | I | L | Nkoroo |
| nkz | | | I | L | Nkari |
| nla | | | I | L | Ngombale |
| nlc | | | I | L | Nalca |
| nld | dut/nld | nl | I | L | Dutch |
| nle | | | I | L | East Nyala |
| nlg | | | I | L | Gela |
| nli | | | I | L | Grangali |
| nlj | | | I | L | Nyali |
| nlk | | | I | L | Ninia Yali |
| nll | | | I | L | Nihali |
| nlo | | | I | L | Ngul |
| nlr | | | I | L | Ngarla |
| nlu | | | I | L | Nchumbulu |
| nlv | | | I | L | Orizaba Nahuatl |
| nlx | | | I | L | Nahali |
| nly | | | I | L | Nyamal |
| nlz | | | I | L | Nalögo |
| nma | | | I | L | Maram Naga |
| nmb | | | I | L | Big Nambas |
| nmc | | | I | L | Ngam |
| nmd | | | I | L | Ndumu |
| nme | | | I | L | Mzieme Naga |
| nmf | | | I | L | Tangkhul Naga |
| nmg | | | I | L | Ngumba |
| nmh | | | I | L | Monsang Naga |
| nmi | | | I | L | Nyam |
| nmj | | | I | L | Ngombe (Central African Republic) |
| nmk | | | I | L | Namakura |
| nml | | | I | L | Ndemli |
| nmm | | | I | L | Manangba |
| nmn | | | I | L | !Xóõ |
| nmo | | | I | L | Moyon Naga |
| nmp | | | I | L | Nimanbur |
| nmq | | | I | L | Nambya |
| nmr | | | I | L | Nimbari |
| nms | | | I | L | Letemboi |
| nmt | | | I | L | Namonuito |
| nmu | | | I | L | Northeast Maidu |
| nmv | | | I | E | Ngamini |
| nmw | | | I | L | Nimoa |
| nmx | | | I | L | Nama (Papua New Guinea) |
| nmy | | | I | L | Namuyi |
| nmz | | | I | L | Nawdm |
| nna | | | I | L | Nyangumarta |
| nnb | | | I | L | Nande |
| nnc | | | I | L | Nancere |
| nnd | | | I | L | West Ambae |
| nne | | | I | L | Ngandyera |
| nnf | | | I | L | Ngaing |
| nng | | | I | L | Maring Naga |
| nnh | | | I | L | Ngiemboon |
| nni | | | I | L | North Nuaulu |
| nnj | | | I | L | Nyangatom |
| nnk | | | I | L | Nankina |
| nnl | | | I | L | Northern Rengma Naga |
| nnm | | | I | L | Namia |
| nnn | | | I | L | Ngete |
| nno | nno | nn | I | L | Norwegian Nynorsk |
| nnp | | | I | L | Wancho Naga |
| nnq | | | I | L | Ngindo |
| nnr | | | I | E | Narungga |
| nns | | | I | L | Ningye |
| nnt | | | I | E | Nanticoke |
| nnu | | | I | L | Dwang |
| nnv | | | I | E | Nugunu (Australia) |
| nnw | | | I | L | Southern Nuni |
| nnx | | | I | L | Ngong |
| nny | | | I | L | Nyangga |
| nnz | | | I | L | Nda'nda' |
| noa | | | I | L | Woun Meu |
| nob | nob | nb | I | L | Norwegian Bokmål |
| noc | | | I | L | Nuk |
| nod | | | I | L | Northern Thai |
| noe | | | I | L | Nimadi |
| nof | | | I | L | Nomane |
| nog | nog | | I | L | Nogai |
| noh | | | I | L | Nomu |
| noi | | | I | L | Noiri |
| nok | | | I | E | Nooksack |
| nom | | | I | E | Nocamán |
| non | non | | I | H | Old Norse |
| nop | | | I | L | Numanggang |
| noq | | | I | L | Ngongo |
| nor | nor | no | M | L | Norwegian |
| nos | | | I | L | Southern Yi |
| not | | | I | L | Nomatsiguenga |
| nou | | | I | L | Ewage-Notu |
| nov | | | I | C | Novial |
| now | | | I | L | Nyambo |
| noy | | | I | L | Noy |
| noz | | | I | L | Nayi |
| npa | | | I | L | Nar Phu |
| npb | | | I | L | Nupbikha |
| nph | | | I | L | Phom Naga |
| nph | | | I | L | Southeastern Puebla Nahuatl |
| npn | | | I | L | Mondropolon |
| npo | | | I | L | Pochuri Naga |
| nps | | | I | L | Nipsan |
| npu | | | I | L | Puimei Naga |
| npy | | | I | L | Napu |
| nqg | | | I | L | Ede Nago |
| nqk | | | I | L | Kura Ede Nago |
| nqm | | | I | L | Ndom |
| nqn | | | I | L | Nen |
| nqo | nqo | | I | L | N'Ko |
| nra | | | I | L | Ngom |
| nrb | | | I | L | Nara |
| nrc | | | I | A | Noric |
| nre | | | I | L | Southern Rengma Naga |
| nrg | | | I | L | Narango |
| nri | | | I | L | Chokri Naga |
| nrl | | | I | L | Ngarluma |
| nrm | | | I | L | Narom |
| nrn | | | I | E | Norn |
| nrp | | | I | A | North Picene |
| nrr | | | I | L | Norra |
| nrt | | | I | E | Northern Kalapuya |
| nru | | | I | L | Narua |
| nrx | | | I | L | Ngurmbur |
| nrz | | | I | L | Lala |
| nsa | | | I | L | Sangtam Naga |
| nsc | | | I | L | Nshi |
| nsd | | | I | L | Southern Nisu |
| nse | | | I | L | Nsenga |
| nsg | | | I | L | Ngasa |
| nsh | | | I | L | Ngoshie |
| nsi | | | I | L | Nigerian Sign Language |
| nsk | | | I | L | Naskapi |
| nsl | | | I | L | Norwegian Sign Language |
| nsm | | | I | L | Sumi Naga |
| nsn | | | I | L | Nehan |
| nso | nso | | I | L | Pedi |
| nsp | | | I | L | Nepalese Sign Language |
| nsq | | | I | L | Northern Sierra Miwok |
| nsr | | | I | L | Maritime Sign Language |
| nss | | | I | L | Nali |
| nst | | | I | L | Tase Naga |
| nsu | | | I | L | Sierra Negra Nahuatl |
| nsv | | | I | L | Southwestern Nisu |
| nsw | | | I | L | Navut |
| nsx | | | I | L | Nsongo |
| nsy | | | I | L | Nasal |
| nsz | | | I | L | Nisenan |
| nte | | | I | L | Nathembo |
| nti | | | I | L | Natioro |
| ntj | | | I | L | Ngaanyatjarra |
| ntk | | | I | L | Ikoma |
| ntm | | | I | L | Nateni |
| nto | | | I | L | Ntomba |
| ntp | | | I | L | Northern Tepehuan |
| ntr | | | I | L | Delo |
| nts | | | I | E | Natagaimas |
| ntu | | | I | L | Natügu |
| ntw | | | I | E | Nottoway |
| nty | | | I | L | Mantsi |
| ntz | | | I | L | Natanzi |
| nua | | | I | L | Yuaga |
| nuc | | | I | E | Nukuini |
| nud | | | I | L | Ngala |
| nue | | | I | L | Ngundu |
| nuf | | | I | L | Nusu |
| nug | | | I | L | Nungali |
| nuh | | | I | L | Ndunda |
| nui | | | I | L | Ngumbi |
| nuj | | | I | L | Nyole |
| nuk | | | I | L | Nuu-chah-nulth |
| nul | | | I | L | Nusa Laut |
| num | | | I | L | Niuafo'ou |
| nun | | | I | L | Anong |
| nuo | | | I | L | Nguôn |
| nup | | | I | L | Nupe-Nupe-Tako |
| nuq | | | I | L | Nukumanu |
| nur | | | I | L | Nukuria |
| nus | | | I | L | Nuer |
| nut | | | I | L | Nung (Viet Nam) |
| nuu | | | I | L | Ngbundu |
| nuv | | | I | L | Northern Nuni |
| nuw | | | I | L | Nguluwan |
| nux | | | I | L | Mehek |
| nuy | | | I | L | Nunggubuyu |
| nuz | | | I | L | Tlamacazapa Nahuatl |
| nvh | | | I | L | Nasarian |
| nvm | | | I | L | Namiae |
| nvo | | | I | L | Nyokon |
| nwa | | | I | E | Nawathinehena |
| nwb | | | I | L | Nyabwa |
| nwc | nwc | | I | H | Classical Newari |
| nwe | | | I | L | Ngwe |
| nwg | | | I | E | Ngayawung |
| nwi | | | I | L | Southwest Tanna |
| nwm | | | I | L | Nyamusa-Molo |
| nwo | | | I | E | Nauo |
| nwr | | | I | L | Nawaru |
| nwx | | | I | H | Middle Newar |
| nwy | | | I | E | Nottoway-Meherrin |
| nxa | | | I | L | Nauete |
| nxd | | | I | L | Ngando (Democratic Republic of Congo) |
| nxe | | | I | L | Nage |
| nxg | | | I | L | Ngad'a |
| nxi | | | I | L | Nindi |
| nxl | | | I | L | South Nuaulu |
| nxm | | | I | A | Numidian |
| nxn | | | I | E | Ngawun |
| nxq | | | I | L | Naxi |
| nxr | | | I | L | Ninggerum |
| nxu | | | I | L | Narau |
| nxx | | | I | L | Nafri |
| nya | nya | ny | I | L | Nyanja |
| nyb | | | I | L | Nyangbo |
| nyc | | | I | L | Nyanga-li |
| nyd | | | I | L | Nyore |
| nye | | | I | L | Nyengo |
| nyf | | | I | L | Giryama |
| nyg | | | I | L | Nyindu |
| nyh | | | I | L | Nyigina |
| nyi | | | I | L | Ama (Sudan) |
| nyj | | | I | L | Nyanga |
| nyk | | | I | L | Nyaneka |
| nyl | | | I | L | Nyeu |
| nym | nym | | I | L | Nyamwezi |
| nyn | nyn | | I | L | Nyankole |
| nyo | nyo | | I | L | Nyoro |
| nyp | | | I | E | Nyang'i |
| nyq | | | I | L | Nayini |
| nys | | | I | E | Nyunga |
| nyt | | | I | L | Nyawaygi |
| nyu | | | I | L | Nyungwe |
| nyv | | | I | L | Nyulnyul |
| nyw | | | I | L | Nyaw |
| nyx | | | I | E | Nganyaywana |
| nyy | | | I | L | Nyakyusa-Ngonde |
| nza | | | I | L | Tigon Mbembe |
| nzb | | | I | L | Njebi |
| nzi | nzi | | I | L | Nzima |
| nzk | | | I | L | Nzakara |
| nzm | | | I | L | Zeme Naga |
| nzs | | | I | L | New Zealand Sign Language |
| nzu | | | I | L | Teke-Nzikou |
| nzy | | | I | L | Nzakambay |

Codici ritirati

| 639-3 | Nome | Motivo del ritiro |
| - | - | - |
| nbf | Naxi | Suddiviso in Narua (nru) e Naxi (nxq) |
| nfg | Nyeng | Unito ad Ahwai (nfd) |
| nfk | Shakara | Unito ad Ahwai (nfd) |
| nhj | Tlalitzlipa Nahuatl | Unito da Zacatlán-Ahuacatlán-Tepetzintla Nahuatl (nhi) |
| nhs | Southeastern Puebla Nahuatl | Suddiviso in Sierra Negra Nahuatl (nsu) e Southeastern Puebla Nahuatl (npl) |
| nky | Khiamniungan Naga | Suddiviso in Khiamniungan Naga (kix), Makuri Naga (jmn), Para Naga (pzn) |
| nln | Durango Nahuatl | Suddiviso in Eastern Durango Nahuatl (azd) e Western Durango Nahuatl (azn) |
| noo | Nootka | Suddiviso in Ditidaht (dtd) e Nuu-chah-nulth (nuk) |
| nxj | Nyadu | Unito da Benyadu' (byd) |

### O

| Cod. | 639-2 | 639-1 | Dom | Tip | Nome |
| - | - | - | - | - | - |
| oaa | | | I | L | Orok |
| oac | | | I | L | Oroch |
| oar | | | I | A | Old Aramaic |
| oav | | | I | H | Old Avar |
| obi | | | I | E | Obispeño |
| obk | | | I | L | Southern Bontok |
| obl | | | I | L | Oblo |
| obm | | | I | A | Moabite |
| obo | | | I | L | Obo Manobo |
| obr | | | I | H | Old Burmese |
| obt | | | I | H | Old Breton |
| obu | | | I | L | Obulom |
| oca | | | I | L | Ocaina |
| och | | | I | A | Old Chinese |
| oci | oci | oc | M | L | Occitan (post 1500) |
| oco | | | I | H | Old Cornish |
| ocu | | | I | L | Atzingo Matlatzinca |
| oda | | | I | L | Odut |
| odk | | | I | L | Od |
| odt | | | I | H | Old Dutch |
| odu | | | I | L | Odual |
| ofo | | | I | E | Ofo |
| ofs | | | I | H | Old Frisian |
| ofu | | | I | L | Efutop |
| ogb | | | I | L | Ogbia |
| ogc | | | I | L | Ogbah |
| oge | | | I | H | Old Georgian |
| ogg | | | I | L | Ogbogolo |
| ogo | | | I | L | Khana |
| ogu | | | I | L | Ogbronuagum |
| oht | | | I | A | Old Hittite |
| ohu | | | I | H | Old Hungarian |
| oia | | | I | L | Oirata |
| oin | | | I | L | Inebu One |
| ojb | | | I | L | Northwestern Ojibwa |
| ojc | | | I | L | Central Ojibwa |
| ojg | | | I | L | Eastern Ojibwa |
| oji | oji | oj | M | L | Ojibwa |
| ojp | | | I | H | Old Japanese |
| ojs | | | I | L | Severn Ojibwa |
| ojv | | | I | L | Ontong Java |
| ojw | | | I | L | Western Ojibwa |
| oka | | | I | L | Okanagan |
| okb | | | I | L | Okobo |
| okd | | | I | L | Okodia |
| oke | | | I | L | Okpe (Southwestern Edo) |
| okh | | | I | L | Koresh-e Rostam |
| oki | | | I | L | Okiek |
| okj | | | I | E | Oko-Juwoi |
| okk | | | I | L | Kwamtim One |
| okl | | | I | E | Old Kentish Sign Language |
| okm | | | I | H | Middle Korean (10th - 16th cent.) |
| okn | | | I | L | Oki-No-Erabu |
| oko | | | I | H | Old Korean (3rd - 9th cent.) |
| okr | | | I | L | Kirike |
| oks | | | I | L | Oko-Eni-Osayen |
| oku | | | I | L | Oku |
| okv | | | I | L | Orokaiva |
| okx | | | I | L | Okpe (Northwestern Edo) |
| ola | | | I | L | Walungge |
| old | | | I | L | Mochi |
| ole | | | I | L | Olekha |
| olm | | | I | L | Oloma |
| olo | | | I | L | Livvi |
| oma | | | I | L | Omaha-Ponca |
| omb | | | I | L | East Ambae |
| omc | | | I | E | Mochica |
| ome | | | I | E | Omejes |
| omg | | | I | E | Omagua |
| omi | | | I | L | Omi |
| omk | | | I | E | Omok |
| oml | | | I | L | Ombo |
| omn | | | I | A | Minoan |
| omo | | | I | L | Utarmbung |
| omp | | | I | H | Old Manipuri |
| omr | | | I | H | Old Marathi |
| omt | | | I | L | Omotik |
| omu | | | I | E | Omurano |
| omw | | | I | L | South Tairora |
| omx | | | I | H | Old Mon |
| ona | | | I | L | Ona |
| onb | | | I | L | Lingao |
| one | | | I | L | Oneida |
| ong | | | I | L | Olo |
| oni | | | I | L | Onin |
| onj | | | I | L | Onjob |
| onk | | | I | L | Kabore One |
| onn | | | I | L | Onobasulu |
| ono | | | I | L | Onondaga |
| onp | | | I | L | Sartang |
| onr | | | I | L | Northern One |
| ons | | | I | L | Ono |
| ont | | | I | L | Ontenu |
| onu | | | I | L | Unua |
| onw | | | I | H | Old Nubian |
| onx | | | I | L | Onin Based Pidgin |
| ood | | | I | L | Tohono O'odham |
| oog | | | I | L | Ong |
| oon | | | I | L | Önge |
| oor | | | I | L | Oorlams |
| oos | | | I | A | Old Ossetic |
| opa | | | I | L | Okpamheri |
| opk | | | I | L | Kopkaka |
| opm | | | I | L | Oksapmin |
| opo | | | I | L | Opao |
| opt | | | I | L | Opata |
| opy | | | I | L | Ofayé |
| ora | | | I | L | Oroha |
| orc | | | I | L | Orma |
| ore | | | I | L | Orejón |
| org | | | I | L | Oring |
| orh | | | I | L | Oroqen |
| ori | ori | or | M | L | Oriya (macrolanguage) |
| orm | orm | om | M | L | Oromo |
| orn | | | I | L | Orang Kanaq |
| oro | | | I | L | Orokolo |
| orr | | | I | L | Oruma |
| ors | | | I | L | Orang Seletar |
| ort | | | I | L | Adivasi Oriya |
| oru | | | I | L | Ormuri |
| orv | | | I | H | Old Russian |
| orw | | | I | L | Oro Win |
| orx | | | I | L | Oro |
| ory | | | I | L | Oriya (individual language) |
| orz | | | I | L | Ormu |
| osa | osa | | I | L | Osage |
| osc | | | I | A | Oscan |
| osi | | | I | L | Osing |
| oso | | | I | L | Ososo |
| osp | | | I | H | Old Spanish |
| oss | oss | os | I | L | Ossetian |
| ost | | | I | L | Osatu |
| osu | | | I | L | Southern One |
| osx | | | I | H | Old Saxon |
| ota | ota | | I | H | Ottoman Turkish (1500-1928) |
| otb | | | I | H | Old Tibetan |
| otd | | | I | L | Ot Danum |
| ote | | | I | L | Mezquital Otomi |
| oti | | | I | E | Oti |
| otk | | | I | H | Old Turkish |
| otl | | | I | L | Tilapa Otomi |
| otm | | | I | L | Eastern Highland Otomi |
| otn | | | I | L | Tenango Otomi |
| otq | | | I | L | Querétaro Otomi |
| otr | | | I | L | Otoro |
| ots | | | I | L | Estado de México Otomi |
| ott | | | I | L | Temoaya Otomi |
| otu | | | I | E | Otuke |
| otw | | | I | L | Ottawa |
| otx | | | I | L | Texcatepec Otomi |
| oty | | | I | A | Old Tamil |
| otz | | | I | L | Ixtenco Otomi |
| oua | | | I | L | Tagargrent |
| oub | | | I | L | Glio-Oubi |
| oue | | | I | L | Oune |
| oui | | | I | H | Old Uighur |
| oum | | | I | E | Ouma |
| oun | | | I | L | !O!ung |
| owi | | | I | L | Owiniga |
| owl | | | I | H | Old Welsh |
| oyb | | | I | L | Oy |
| oyd | | | I | L | Oyda |
| oym | | | I | L | Wayampi |
| oyy | | | I | L | Oya'oya |
| ozm | | | I | L | Koonzime |

Codici ritirati

| 639-3 | Nome | Motivo del ritiro |
| - | - | - |
| occ | Occidental | Unito a Interlingue (ile) come duplicato |
| ogn | Ogan | Unito a Central Malay (pse) |
| ope | Old Persian | Unito da Old Persian (ca. 600-400 B.C.) (peo) come duplicato |
| ork | Orokaiva | Suddiviso in Aeka (aez), Hunjara-Kaina Ke (hkk), Orokaiva (okv) |
