| Language | Group | 
| A | 
| Aari | Semitic | 
| AB language | Indo-European | 
| Abau | Sepik | 
| Abaza | Northwest Caucasian | 
| Abenaki | Eastern Algonquian | 
| Abkhaz or Abkhazian | Northwest Caucasian | 
| Abujmaria or Madiya or Maria | Dravidian | 
| Acehnese | Malayo-Polynesian | 
| Adamorobe Sign Language | Language isolate | 
| Adele | Kwa | 
| Adyghe or West Circassian | Northwest Caucasian | 
| Afar | Cushitic | 
| Afrikaans | Germanic | 
| Afro-Seminole Creole | English-based creole | 
| Aguaruna | Chicham | 
| Ahom | Kra–Dai | 
| Aimaq or Barbari | Iranian | 
| Ainu, Hokkaido | Ainu | 
| Ainu, Kuril | Ainu | 
| Ainu, Sakhalin | Ainu | 
| Ajawa | Chadic | 
| Ajem-Turkic or Ajami Turkic | Turkic | 
| Aka-Bea | Great Andamanese | 
| Aka-Bo | Great Andamanese | 
| Aka-Cari | Great Andamanese | 
| Aka-Jeru | Great Andamanese | 
| Aka-Kede | Great Andamanese | 
| Aka-Kol | Great Andamanese | 
| Aka-Kora | Great Andamanese | 
| Akan | Kwa | 
| Akar-Bale | Great Andamanese | 
| Akateko | Mayan | 
| Akawaio | Cariban | 
| Akkadian | Semitic | 
| Aklanon | Bisayan | 
| Alabama | Muskogean | 
| Alanic | Iranian | 
| Albanian | Albanoid | 
| Albanian, Arbëresh | Albanoid | 
| Albanian, Arvanitika or Arvanitic | Albanoid | 
| Albanian, Gheg | Albanoid | 
| Albanian, Tosk | Albanoid | 
| Alchuka | Tungusic | 
| Aleut | Eskimo–Aleut | 
| Aleut, Mednyj | Russian and Aleut-based mixed language | 
| Algonquin | Algonquian | 
| Alsatian | Germanic | 
| Altay | Turkic | 
| Alyutor or Alutor | Chukotko-Kamchatkan | 
| Alzenau German | Germanic | 
| Amdang | Nilo-Saharan | 
| American Sign Language | Francosign | 
| Amharic | Semitic | 
| Ammonite | Semitic | 
| Amorite | Semitic | 
| Amuzgo | Oto-Manguean | 
| Angami Naga Sign Language | Language isolate | 
| Angika | Indo-Aryan | 
| Anyin | Kwa | 
| Ao | Tibeto-Burman | 
| Aquitanian | Basque | 
| Arabic | Semitic | 
| Arabic, Algerian | Semitic | 
| Arabic, Algerian Saharan | Semitic | 
| Arabic, Anatolian | Semitic | 
| Arabic, Andalusian or Andalusi Arabic | Semitic | 
| Arabic, Bahrani | Semitic | 
| Arabic, Bareqi | Semitic | 
| Arabic, Bimbashi or Mongallese | Semitic | 
| Arabic, Central Asian | Semitic | 
| Arabic, Chadian | Semitic | 
| Arabic, Classical | Semitic | 
| Arabic, Cypriot | Semitic | 
| Arabic, Dhofari | Semitic | 
| Arabic, Egyptian | Semitic | 
| Arabic, Gilit | Semitic | 
| Arabic, Gulf | Semitic | 
| Arabic, Hadhrami | Semitic | 
| Arabic, Hassaniya | Semitic | 
| Arabic, Hejazi | Semitic | 
| Arabic, Jebli | Semitic | 
| Arabic, Jijel | Semitic | 
| Arabic, Juba or South Sudanese Arabic | Semitic | 
| Arabic, Judeo-Iraqi or Yahudic | Semitic | 
| Arabic, Judeo-Moroccan | Semitic | 
| Arabic, Judeo-Tripolitanian | Semitic | 
| Arabic, Judeo-Yemeni | Semitic | 
| Arabic, Khuzestani | Semitic | 
| Arabic, Levantine | Semitic | 
| Arabic, Libyan | Semitic | 
| Arabic, Maridi | Semitic | 
| Arabic, Modern Standard | Semitic | 
| Arabic, Moroccan | Semitic | 
| Arabic, Nabataean | Semitic | 
| Arabic, Najdi | Semitic | 
| Arabic, Qeltu or North Mesopotamian Arabic | Semitic | 
| Arabic, Northwest Arabian, Levantine Bedawi Arabic, or Eastern Egyptian Bedawi Arabic | Semitic | 
| Arabic, Nubi or Ki-Nubi | Semitic | 
| Arabic, Omani | Semitic | 
| Arabic, Sanʽani | Semitic | 
| Arabic, Saʽidi | Semitic | 
| Arabic, Shihhi | Semitic | 
| Arabic, Shirvani | Semitic | 
| Arabic, Sicilian or Siculo-Arabic | Semitic | 
| Arabic, Sudanese | Semitic | 
| Arabic, Taʽizzi-Adeni or Southern Yemeni Arabic | Semitic | 
| Arabic, Tihamiyya | Semitic | 
| Arabic, Tunisian | Semitic | 
| Aragonese | Romance | 
| Aramaic | Semitic | 
| Are | Malayo-Polynesian | 
| ꞋAreꞌare | Malayo-Polynesian | 
| Argobba | Semitic | 
| Arin | Yeniseian | 
| Aromanian | Romance | 
| Armazic | Semitic | 
| Armenian | Indo-European | 
| Armenian, Eastern | Armenian | 
| Armenian, Homshetsi | Armenian | 
| Armenian, Western | Armenian | 
| Armenian, Zok or Agulis | Armenian | 
| Armenian Sign Language | Language isolate | 
| Aro | Omotic | 
| Asa | Cushitic | 
| Ashkun | Indo-Iranian | 
| Assamese | Indo-Iranian | 
| Ateso or Teso | Nilotic | 
| Asháninka | Arawakan | 
| Ashokan Prakrit | Indo-Aryan | 
| Asi | Malayo-Polynesian | 
| Asturian | Romance | 
| Asturleonese | Romance | 
| Atong Language | Tibeto-Burman | 
| Auslan | BANZSL | 
| Avar | Northeast Caucasian | 
| Avestan | Iranian | 
| Awadhi | Indo-Iranian | 
| Aymara | Aymaran | 
| Äynu | Turkic | 
| Ayoreo | Zamucoan | 
| Azerbaijani or Azeri | Turkic | 
| B | 
| Babuza | Western Plains Formosan | 
| Bactrian | Iranian | 
| Badaga | Dravidian | 
| Badeshi | Indo-Iranian | 
| Baekje | Unclassified language, perhaps Koreanic, Puyŏ, and/or Han | 
| Bahnar | Austroasiatic | 
| Bailang | Lolo-Burmese | 
| Bakor | Bantu | 
| Bala | Tungusic | 
| Balinese | Malayo-Polynesian | 
| Balkan Gagauz or Rumelian Turkish | Turkic | 
| Balochi | Indo-Iranian | 
| Balti | Tibeto-Burman | 
| Bambara or Bamanankan | Mande | 
| Banjar | Malayo-Polynesian | 
| Banyumasan | Malayo-Polynesian | 
| Barranquenho or Barranquenhu | Alentejan Portuguese, Extremaduran Spanish, and Andalusian Spanish-based mixed language | 
| Bartangi | Iranian | 
| Basaa | Bantu | 
| Basay | East Formosan | 
| Bashkardi | Iranian | 
| Bashkir | Turkic | 
| Basque or Euskara/Euskera | Language isolate | 
| Batak Karo | Malayo-Polynesian | 
| Batak Toba | Malayo-Polynesian | 
| Bats | North Caucasian | 
| Bavarian | Germanic | 
| Bawean and Bawean Creole | Madurese | 
| Beja | Cushitic | 
| Belarusian | Slavic | 
| Belhare | Tibeto-Burman | 
| Berta | Nilo-Saharan | 
| Bemba | Bantu | 
| Bengali | Indo-Aryan | 
| Bezhta | Northeast Caucasian | 
| Berber | Afroasiatic | 
| Betawi | Malayo-Polynesian | 
| Bete | Niger–Congo | 
| Bété | Niger–Congo | 
| Bhili | Indo-Aryan | 
| Bhojpuri | Indo-Aryan | 
| Bijil Neo-Aramaic | Semitic | 
| Bikol | Malayo-Polynesian | 
| Bikya or Furu | Bantu | 
| Bissa | Mande | 
| Blackfoot | Algonquian | 
| Bodo | Sino-Tibetan | 
| Boholano | Malayo-Polynesian | 
| Bohtan Neo-Aramaic | Semitic | 
| Bonan or Paoan | Mongolic | 
| Bororo | Bororoan | 
| Bosnian | Slavic | 
| Brahui | Dravidian | 
| Breton | Celtic | 
| British Sign Language | BANZSL | 
| Bru | Austroasiatic | 
| Bua | Niger–Congo | 
| Buginese | Malayo-Polynesian | 
| Bukusu | Bantu | 
| Bulgar | Turkic | 
| Bulgarian | Slavic | 
| Bulgarian, Banat | Slavic | 
| Bunjevac | Slavic | 
| Burmese | Tibeto-Burman | 
| Burushaski | Language isolate | 
| Buryat | Mongolic | 
| Buyeo | Puyŏ | 
| C | 
| Caluyanon or Caluyanun | Malayo-Polynesian | 
| Cameroonian Pidgin English | English-based creole | 
| Camfranglais | Cameroonian French, Cameroonian English, and Cameroonian Pidgin English-based mixed language | 
| Canaano-Akkadian | Akkadian and Canaanite-based mixed language | 
| Cape Verdean Creole or Kabuverdianu | Portuguese-based creole | 
| Carrier or Dakelh | Athabaskan | 
| Catalan | Romance | 
| Catalan Sign Language | Catalan Sign | 
| Caucasian Sign Language | Language isolate | 
| Cavineña | Tacanan | 
| Cayuga | Iroquoian | 
| Cebuano | Malayo-Polynesian | 
| Chabacano or Chavacano | Spanish-based creole | 
| Chaga or Kichagga | Bantu | 
| Chagatai | Turkic | 
| Chakavian | Slavic | 
| Chakma | Indo-Aryan | 
| Cham | Chamic | 
| Chamorro or Chamoru | Malayo-Polynesian | 
| Chaouia or Tachawit | Berber | 
| Chatino | Oto-Manguean | 
| Chechen | Northeast Caucasian | 
| Chenchu | Dravidian | 
| Chenoua | Berber | 
| Cherokee | Iroquoian | 
| Cheyenne | Algonquian | 
| Chhattisgarhi | Indo-Aryan | 
| Chichimeca Jonaz | Oto-Manguean | 
| Chickasaw | Muskogean | 
| Chintang or Chhintang | Kiranti | 
| Chilcotin or Tsilhqot'in | Athabaskan | 
| Chinantec | Oto-Manguean | 
| Chinese Kyakala | Tungusic | 
| Chinese | Sinitic | 
| Chinese, Ba–Shu | Sinitic | 
| Chinese, Cantonese | Sinitic | 
| Chinese, Gan | Sinitic | 
| Chinese, Hakka | Sinitic | 
| Chinese, Mandarin | Sinitic | 
| Chinese, Taz | Sinitic | 
| Chinese, Waxiang | Sinitic | 
| Chinese, Wenzhounese | Sinitic | 
| Chinese, Wu | Sinitic | 
| Chinese, Xiang | Sinitic | 
| Chinese, Yue | Sinitic | 
| Chiricahua or Mescalero-Chiricahua Apache | Athabaskan | 
| Chichewa or Nyanja | Bantu | 
| Chimané or Tsimané or Mosetén | Language isolate | 
| Chipaya | Uru-Chipaya | 
| Chipewyan | Athabaskan | 
| Chiquimulilla | Xincan | 
| Chiquitano | Language isolate | 
| Chittagonian | Indo-Aryan | 
| Chocho or Chocholtec | Oto-Manguean | 
| Choctaw | Muskogean | 
| Ch'ol | Mayan | 
| Chontal de Oaxaca | Tequistlatecan | 
| Chontal de Tabasco | Mayan | 
| Chorasmian or Khwarezmian | Iranian | 
| Christian Palestinian Aramaic | Semitic | 
| Chuj | Mayan | 
| Chukchi or Chukot | Chukotko-Kamchatkan | 
| Chulym | Turkic | 
| Church Slavonic | Slavic | 
| Chuukese or Trukese | Malayo-Polynesian | 
| Chuvan | Yukaghir | 
| Chuvash | Turkic | 
| Cochin Portuguese Creole or Vypin Indo-Portuguese | Portuguese-based creole language | 
| Cocoma or Cocama | Tupian | 
| Cocopah | Yuman-Cochimí | 
| Coeur d’Alene | Salishan | 
| Comanche | Uto-Aztecan | 
| Comorian | Bantu | 
| Coptic | Egyptian | 
| Cora | Uto-Aztecan | 
| Cornish | Celtic | 
| Corsican | Romance | 
| Cree | Algonquian | 
| Cree, East or James Bay Cree | Algonquian | 
| Cree, Moose | Algonquian | 
| Cree, Plains | Algonquian | 
| Cree, Swampy | Algonquian | 
| Cree, Woods or Woodland Cree | Algonquian | 
| Crimean Tatar or Crimean Turkish | Turkic | 
| Croatian | Slavic | 
| Croatian, Burgenland | Slavic | 
| Cuicatec | Oto-Manguean | 
| Cuyonon | Malayo-Polynesian | 
| Czech | Slavic | 
| D | 
| Dadanitic | Semitic | 
| Dagaare | Niger-Congo | 
| Dagbani | Gur | 
| Dahlik | Semitic | 
| Dalecarlian | Germanic | 
| Dalmatian | Romance | 
| Dameli | Indo-Aryan | 
| Danish | Germanic | 
| Dargin | Northeast Caucasian | 
| Dari or Dari Persian | Iranian | 
| Daur or Dagur | Mongolic | 
| Daylami | Iranian | 
| Dena'ina or Tanaina | Athapaskan | 
| Dhatki | Indo-Aryan | 
| Dhivehi or Maldivian | Indo-Aryan | 
| Dicamay Agta | Northern Luzon | 
| Dida | Kru | 
| Dioula or Jula | Mande | 
| Dogri | Indo-Aryan | 
| Dogrib or Tli Cho | Athapaskan | 
| Dolgan | Turkic | 
| Domaaki or Dumaki | Indo-Aryan | 
| Dongxiang or Santa | Mongolic | 
| Duala | Bantu | 
| Dungan | Sinitic | 
| Dura | Greater Magaric | 
| Dutch | Germanic | 
| Dzhidi or Judeo-Persian | Iranian | 
| Dzongkha | Tibetic | 
| E | 
| Eblaite | Semitic | 
| Edomite | Semitic | 
| Egyptian | Afroasiatic | 
| Ekoti | Bantu | 
| Elamite | Semitic | 
| Enets or Yenisey Samoyed | Samoyedic | 
| English | Germanic | 
| English, Euro | Germanic | 
| English, International | Germanic | 
| English, Northern | Germanic | 
| English, Northumbrian | Germanic | 
| Erzya | Uralic | 
| Estonian | Uralic | 
| Even | Tungusic | 
| Evenk or Evenki | Tungusic | 
| Ewe | Volta–Niger | 
| Extremaduran | Romance | 
| F | 
| Faetar or Faetar–Cigliàje | Romance | 
| Faifi | Semitic | 
| Faliscan | Latino-Faliscan | 
| Fang | Bantu | 
| Faroese | Germanic | 
| Favorlang | Western Plains Formosan | 
| Fijian | Malayo-Polynesian | 
| Filipino | Central Philippine | 
| Finland-Swedish Sign Language | Swedish Sign | 
| Finnish | Uralic | 
| Finnish Sign Language | Swedish Sign | 
| Flemish | Germanic | 
| Flemish, East | Germanic | 
| Flemish, French | Germanic | 
| Flemish, West | Germanic | 
| Foodo | Kwa | 
| Fon | Kwa | 
| Franco-Provençal or Arpitan | Romance | 
| French | Romance | 
| French Sign Language | Francosign | 
| Frisian, East | Germanic | 
| Frisian, Hindeloopen | Germanic | 
| Frisian, North | Germanic | 
| Frisian, Saterland | Germanic | 
| Frisian, Schiermonnikoog | Germanic | 
| Frisian, Terschelling | Germanic | 
| Frisian, West or Mainland West Frisian | Germanic | 
| Friulian | Romance | 
| Fula, Fulfulde, or Fulani | Senegambian | 
| Fur | Nilo-Saharan | 
| Futunan | Polynesian | 
| Futuna-Aniwa | Polynesian | 
| G | 
| Ga | Kwa | 
| Gadaba | Dravidian | 
| Gagauz | Turkic | 
| Galatian | Celtic | 
| Galician | Romance | 
| Galindian | Baltic | 
| Ganda | Bantu | 
| Gangte | Kuki-Chin | 
| Gardiol | Romance | 
| Garhwali | Indo-Aryan | 
| Gawar-Bati or Gowari or Narsati | Indo-Aryan | 
| Gaya | Unclassified language | 
| Gayo | Malayo-Polynesian | 
| Ge'ez | Semitic | 
| Gelao | Kra–Dai | 
| Gen or Gẽ or Mina | Volta–Niger | 
| Georgian | South Caucasian | 
| German | Germanic | 
| German Sign Language | DGSic | 
| Gikuyu or Kikuyu | Bantu | 
| Gilbertese or Kiribati | Malayo-Polynesian | 
| Gilaki | Iranian | 
| Gitxsan | Tsimshianic | 
| Goaria | Indo-Aryan | 
| Goguryeo | Puyŏ | 
| Gondi | Dravidian | 
| Gora or Gorani | Slavic | 
| Goral | Slavic | 
| Gorani or Hawrami | Iranian | 
| Gothic | Germanic | 
| Greenlandic or Kalaallisut | Eskaleut | 
| Greenlandic Norse | Germanic | 
| Greek | Hellenic | 
| Greek, Aeolic | Hellenic | 
| Greek, Apulian or Griko | Hellenic | 
| Greek, Ancient Macedonian | Hellenic | 
| Greek, Arcadocypriot | Hellenic | 
| Greek, Attic | Hellenic | 
| Greek, Byzantine or Medieval Greek | Hellenic | 
| Greek, Calabrian | Hellenic | 
| Greek, Cappadocian | Hellenic | 
| Greek, Cypriot | Hellenic | 
| Greek, Doric or West Greek | Hellenic | 
| Greek, Homeric or Epic Greek | Hellenic | 
| Greek, Ionic | Hellenic | 
| Greek, Italiot | Hellenic | 
| Greek, Jewish Koine | Hellenic | 
| Greek, Koine | Hellenic | 
| Greek, Mariupolitan or Crimean Greek | Hellenic | 
| Greek, Mycenaean | Hellenic | 
| Greek, Pamphylian | Hellenic | 
| Greek, Pontic | Hellenic | 
| Greek, Tsakonian | Hellenic | 
| Greek, Yevanic | Hellenic | 
| Greek Slavic | Slavic | 
| Guaraní | Tupian | 
| Guaruyu | Tupian | 
| Guazacapán | Xincan | 
| Guinea-Bissau Creole | Portuguese-based creole | 
| Gujarati | Indo-Aryan | 
| Gula Iro or Kulaal | Adamawa | 
| Gullah or Sea Island Creole English | English-based creole | 
| Gusii | Bantu | 
| Gwichʼin | Athabaskan | 
| H | 
| Hachijō or shima kotoba | Japonic | 
| Hadramautic | Semitic | 
| Hadza or Hatsa | Language isolate | 
| Haida or Masset | Language isolate or Na-Dené | 
| Haitian Creole | French-based creole | 
| Hän | Athabaskan | 
| Hani | Lolo-Burmese | 
| Harappan | Unclassified language | 
| Harari | Semitic | 
| Harauti | Indo-Aryan | 
| Harsusi | Semitic | 
| Haryanavi | Indo-Aryan | 
| Harzani | Iranian | 
| Hasaitic | Semitic | 
| Hattic | Unclassified language | 
| Hausa | Chadic | 
| Havasupai or Upland Yuman | Hokan | 
| Hawaiian | Polynesian | 
| Hawaiʻi Sign Language | Language isolate or small language family | 
| Hazaragi | Iranian | 
| Hebrew | Semitic | 
| Hebrew, Ashkenazi | Semitic | 
| Hebrew, Biblical | Semitic | 
| Hebrew, Italian | Semitic | 
| Hebrew, Medieval | Semitic | 
| Hebrew, Mishnaic | Semitic | 
| Hebrew, Mizrahi | Semitic | 
| Hebrew, Modern | Semitic | 
| Hebrew, Samaritan | Semitic | 
| Hebrew, Sephardi | Semitic | 
| Hebrew, Tiberian | Semitic | 
| Hebrew, Yemenite | Semitic | 
| Herero | Bantu | 
| Hértevin | Semitic | 
| Hiligaynon | Bisayan | 
| Himyaritic | Semitic | 
| Hindi | Indo-Aryan | 
| Hindustani | Indo-Aryan) | 
| Hinukh | Northeast Caucasian | 
| Hiri Motu | Motu-based pidgin | 
| Hismaic | Semitic | 
| Hittite | Anatolian | 
| Hixkaryana | Cariban | 
| Hmong | Hmong–Mien | 
| Hmu | Hmong-Mien | 
| Ho | Austroasiatic | 
| Hobyót | Semitic | 
| Hokkien | Sinitic | 
| Hopi | Uto-Aztecan | 
| Hoti | Malayo-Polynesian | 
| Huastec or Teenek | Mayan | 
| Huave | Language isolate | 
| Huiliche | Araucanian | 
| Hulaulá | Semitic | 
| Hungarian | Uralic | 
| Hunnic | Unclassified language | 
| Hutterisch or Tirolean | Germanic | 
| Hwa miao | Hmongic | 
| I | 
| Ibibio | Cross River | 
| Iban | Malayic | 
| Ibanag | Northern Luzon | 
| Icelandic | Germanic | 
| Ifè | Yoruboid | 
| Igbo or Ibo or Biafra | Igboid | 
| Ikalanga or Kalanga | Bantu | 
| Ili Turki | Turkic | 
| Illyrian | Albanoid | 
| Ilokano or Ilocano | Northern Luzon | 
| Inabaknon Language | Austronesian | 
| Indonesian | Malayic | 
| Indo-Portuguese Creole of Bombay | Portuguese-based creole language | 
| Ingrian or Izhorian | Uralic | 
| Ingush | Northeast Caucasian | 
| Inuktitut | Eskimo–Aleut | 
| Inupiaq | Eskimo–Aleut | 
| Inuvialuktun | Eskimo–Aleut | 
| Iraqw | Cushitic | 
| Irish or Irish Gaelic | Celtic | 
| Irish Sign Language | Francosign | 
| Irula | Dravidian | 
| Isan or Northeastern Thai | Kra–Dai | 
| Ishkashimi or Ishkashmi | Iranian | 
| Israeli Sign Language | DGSic | 
| Istriot | Romance | 
| Istro-Romanian | Romance | 
| Italian | Romance | 
| J | 
| Jacaltek, Jakalteko or Popti' | Mayan | 
| Jalaa | Unclassified language, possibly Niger–Congo | 
| Japanese | Japonic | 
| Japhug | Sino-Tibetan | 
| Jaqaru | Aymaran | 
| Jarai | Malayo-Polynesian | 
| Javanese | Malayo-Polynesian | 
| Jeju | Koreanic | 
| Jemez or Towa | Tanoan | 
| Jewish Babylonian Aramaic | Aramaic | 
| Jewish Neo-Aramaic dialect of Zakho | Semitic | 
| Jibbali or Shehri | Semitic | 
| Jicarilla | Athabaskan | 
| Juang | Austroasiatic | 
| Judeo-Georgian | South Caucasian | 
| Jumaytepeque | Xincan | 
| Jurchen | Tungusic | 
| K | 
| Kaaps | Germanic | 
| Kabardian | Northwest Caucasian | 
| Kabiye | Gur | 
| Kabyle | Berber | 
| Kachin or Jingpo | Tibeto-Burman | 
| Kaingáng | Jê | 
| Kajkavian | Slavic | 
| Kalami or Gawri or Dirwali | Indo-Aryan | 
| Kalahsa-mun | Indo-Aryan | 
| Kalašma | Anatolian | 
| Kalmyk | Mongolic | 
| Kalto or Nahali | Indo-Aryan | 
| Kamassian | Uralic | 
| Kamchadal, Eastern | Khukotko-Kamchatkan | 
| Kamchadal, Southern | Khukotko-Kamchatkan | 
| Kamchadal, Western or Itelmen | Chukotko-Kamchatkan | 
| Kamtapuri or Rangpuri or Rajbongshi | Indo-Aryan | 
| Kankanaey | Northern Luzon | 
| Kannada | Dravidian | 
| Kanuri | Saharan | 
| Kaonde or Chikaonde | Bantu | 
| Kapampangan | Malayo-Polynesian | 
| Karachay–Balkar | Turkic | 
| Karagas | Turkic | 
| Karaim | Turkic | 
| Karakalpak | Turkic | 
| Karelian | Uralic | 
| Karen | Tibeto-Burman | 
| Kashmiri | Indo-Aryan | 
| Kashubian | Slavic | 
| Kasiguranin or Casiguran | Central Philippine | 
| Kawésqar or Alacaluf | Language isolate | 
| Kazakh | Turkic | 
| Kerek | Chukotko-Kamchatkan | 
| Keres or Keresan | Language isolate or small language family | 
| Ket | Yeniseian | 
| Khakas | Turkic | 
| Khalaj | Turkic | 
| Kham or Sheshi | Tibeto-Burman | 
| Khandeshi | Indo-Aryan | 
| Khanty or Ostyak | Uralic | 
| Khasi | Austroasiatic | 
| Khitan | Mongolic | 
| Khmer | Austroasiatic | 
| Khmu | Austroasiatic | 
| Khowar | Indo-Aryan | 
| Kimatuumbi | Bantu | 
| Kinaray-a or Hiraya | Malayo-Polynesian | 
| Kinyarwanda | Bantu | 
| Kirombo | Bantu | 
| Kirundi | Bantu | 
| Kivunjo | Bantu | 
| Klallam or Clallam | Salishan | 
| Koasati or Coushatta | Muskogean | 
| Knaanic | Slavic | 
| Kodava or Kodagu or Coorgi | Dravidian | 
| Kohistani or Khili | Indo-Aryan | 
| Kolami | Dravidian | 
| Komi or Komi-Zyrian | Uralic | 
| Konkani | Indo-Aryan | 
| Kongo or Kikongo | Bantu | 
| Koraga | Dravidian | 
| Korandje | Nilo-Saharan | 
| Korean | Koreanic | 
| Korku | Austroasiatic | 
| Korowai | Trans–New Guinea | 
| Korwa | Austroasiatic | 
| Koryak | Chukotko-Kamchatkan | 
| Kosraean | Malayo-Polynesian | 
| Kota | Dravidian | 
| Koyra Chiini or Western Songhay | Nilo-Saharan | 
| Koy Sanjaq Christian Neo-Aramaic | Semitic | 
| Koya | Dravidian | 
| Krymchak or Judeo-Crimean Tatar | Turkic | 
| Kujarge | Unclassified language, perhaps Chadic | 
| Kui | Dravidian | 
| Kukkuzi | Uralic | 
| Kumauni | Indo-Aryan | 
| Kumeyaay or Kumiai | Yuma-Cochimí (Hokan?) | 
| Kumyk | Turkic | 
| Kumzari | Iranian | 
| !Kung | Kxʼa | 
| Kurdish | Iranian | 
| Kurdish, Abduyi Iranian | 
| Kurdish, Central or Sorani | Iranian | 
| Kurdish, Laki | Iranian | 
| Kurdish, Northern or Kurmanji | Iranian | 
| Kurdish, Southern | Iranian | 
| Kurukh or Kurux | Dravidian | 
| Kusunda | Language isolate | 
| Kutenai or Kootenay or Ktunaxa | Language isolate | 
| Kuy | Austroasiatic | 
| Kven | Uralic | 
| Kwak'wala | Wakashan | 
| Kwanyama or Ovambo | Bantu | 
| Kxoe | Khoe | 
| Kyrgyz or Kirghiz | Turkic | 
| L | 
| Laal | Unclassified language | 
| Lacandon | Mayan | 
| Lach | Slavic | 
| Ladakhi | Tibeto-Burman | 
| Ladin | Romance | 
| Ladino or Judeo-Spanish | Romance | 
| Lak | Northeast Caucasian | 
| Laki | Iranian | 
| Lakota or Lakhota or Teton | Siouan | 
| Lambadi or Lamani or Banjari | Indo-Aryan | 
| Lanuvian | Latino-Faliscan | 
| Lao or Laotian | Kra–Dai | 
| Larestani | Iranian | 
| Latin | Latino-Faliscan | 
| Latgalian | Baltic | 
| Latvian | Baltic | 
| Laz or Lazuri | South Caucasian | 
| Lemko | Slavic | 
| Lenca, Honduran | Lencan | 
| Lenca, Salvadoran | Lencan | 
| Leonese | Romance | 
| Lezgi or Agul | Northeast Caucasian | 
| Ligbi or Ligby | Mande | 
| Limburgish | Germanic | 
| Lingala | Bantu | 
| Lipan | Athabascan | 
| Lisan al-Dawat | Indo-Aryan | 
| Lishanid Noshan or Lishana Didan | Semitic | 
| Lithuanian | Baltic | 
| Livonian or Liv | Uralic | 
| Livvi-Karelian, Olonets Karelian, or Livvi | Uralic | 
| Lobala or Bala | Bantu | 
| Lomavren | Lom and Armenian-based mixed language | 
| Lombard | Romance | 
| Lotha | Tibeto-Burman | 
| Low Alemannic German | Germanic | 
| Low German | Germanic | 
| Lower Sorbian | Slavic | 
| Lozi or Silozi | Bantu | 
| Ludic or Ludian | Uralic | 
| Lunda or Chilunda | Bantu | 
| Luri | Iranian | 
| Lushootseed | Salishan | 
| Lusoga or Soga | Bantu | 
| Luvale | Bantu | 
| Luwati | Indo-Aryan | 
| Luxembourgish | Germanic | 
| M | 
| Macedonian | Slavic | 
| Machiguenga | Arawakan | 
| Madí or Jamamadí or Kapaná | Arauan | 
| Madurese | Malayo-Polynesian | 
| Magadhi | Indo-Aryan | 
| Marcho-Magdeburgian | Slavic | 
| Matagi | Japanese-based cant | 
| Maguindanao | Malayo-Polynesian | 
| Maithili | Indo-Aryan | 
| Makasar | Malayo-Polynesian | 
| Makhuwa or Makua | Bantu | 
| Makhuwa-Meetto | Bantu | 
| Malagasy | Malayo-Polynesian | 
| Malay | Malayic | 
| Malay, Brunei | Malayic | 
| Malayalam | Dravidian | 
| Malaysian Sign Language | Francosign | 
| Maltese or Maltese Arabic | Semitic | 
| Malto or Sauria Paharia | Dravidian | 
| Malvi, Malavi, or Ujjaini | Indo-Aryan | 
| Mam | Mayan | 
| Manchu | Tungusic | 
| Mandaic | Semitic | 
| Mandinka | Mande | 
| Mansi or Vogul | Uralic | 
| Manx | Celtic | 
| Manyika | Bantu | 
| Māori | Malayo-Polynesian | 
| Mapudungun or Mapuche | Araucanian | 
| Maranao | Malayo-Polynesian | 
| Marathi | Indo-Aryan | 
| Mari or Cheremis | Uralic | 
| Maria | Dravidian | 
| Marquesan | Malayo-Polynesian | 
| Marshallese or Ebon | Malayo-Polynesian | 
| Martha's Vineyard Sign Language | Language isolate | 
| Masaba | Bantu | 
| Masbatenyo or Minasbate | Malayo-Polynesian | 
| Masurian | Slavic | 
| Median | Iranian | 
| Meitei or Manipuri or Meithei | Tibeto-Burman | 
| Mauritian Creole or Morisyen | French-based creole | 
| Mayan Sign Language | Language isolate or small language family | 
| Mayo | Uto-Aztecan | 
| Mazandarani or Tabari | Iranian | 
| Mazahua | Oto-Manguean | 
| Mazatec | Oto-Manguean | 
| Meänkieli or Tornedalian Finnish | Uralic | 
| Megleno-Romanian | Romance | 
| Megrelian or Mingrelian | South Caucasian | 
| Mehri or Mahri | Semitic | 
| Menominee | Algonquian | 
| Mentawai | Malayo-Polynesian | 
| Meroitic | Unclassified language, maybe Nilo-Saharan or Language isolate | 
| Meru or Kimeru | Bantu | 
| Mescalero | Athabaskan | 
| Messapic | Albanoid | 
| Michif | Métis French and Plains Cree-based mixed language | 
| Mikasuki or Miccosukee | Muskogean | 
| Mi'kmaq or Micmac | Algonquian | 
| Minaean | Semitic | 
| Minangkabau | Malayo-Polynesian | 
| Mirandese | Romance | 
| Miskito or Miskitu | Misumalpan | 
| Mnong or M'Nong | Austroasiatic | 
| Mobilian Jargon | Choctaw and French-based pidgin | 
| Moghol | Mongolic | 
| Mohawk | Iroquoian | 
| Moksha | Uralic | 
| Molengue | Bantu | 
| Mon | Austroasiatic | 
| Middle Mongol | Mongolic | 
| Mongolian | Mongolic | 
| Mongolian, Classical | Mongolic | 
| Mono | Ubangian | 
| Mono | Uto-Aztecan | 
| Mono | Malayo-Polynesian | 
| Montagnais or Innu | Algonquian | 
| Montenegrin | Slavic | 
| Mopan | Mayan | 
| Motu | Papuan Tip | 
| Moxo | Arawakan | 
| Muher | Semitic | 
| Mundari | Austroasiatic | 
| Mundurukú | Tupian | 
| Munji | Iranian | 
| Muong | Austroasiatic | 
| Muria | Dravidian | 
| Muscogee or Creek | Muskogean | 
| N | 
| Nafaanra | Senufo | 
| Nagarchal | Dravidian | 
| Nahuatl | Uto-Aztecan | 
| Nama or Khoekhoe | Khoe | 
| Nanai | Tungusic | 
| Nauruan | Micronesian | 
| Navajo or Navaho | Na-Dené | 
| Ndau or Southeast Shona | Bantu | 
| Ndonga | Bantu | 
| Neapolitan | Romance | 
| Negidal | Tungusic | 
| Nenets or Yurak | Samoyedic | 
| Nepal Bhasa or Newari | Newaric | 
| Nepali | Indo-Aryan | 
| New Zealand Sign Language | BANZSL | 
| Nihali or Nahali | Language isolate | 
| Nisga'a | Tsimshianic | 
| Nganasan or Tavgi | Samoyedic | 
| Ngumba | Bantu | 
| Nheengatu or Geral or Modern Tupí | Tupian | 
| Nias | Northwest Sumatra–Barrier Islands | 
| Nicaraguan Sign Language | Language isolate | 
| Niellim | Adamawa | 
| Nigerian Pidgin | English-based pidgin | 
| Nisenan | Maiduan | 
| Niuean or Niue | Polynesian | 
| Nivkh or Gilyak | Language isolate | 
| Nogai | Turkic | 
| Norfuk or Norfolk | cant, English-Tahitian based | 
| Noric | Celtic | 
| Norman or Norman-French | Romance | 
| Norn | Germanic | 
| Northern Ndebele | Bantu | 
| Northern Paiute | Uto-Aztecan | 
| Northern Sotho or Sepedi | Bantu | 
| Northern Straits Salish | Salishan | 
| Norwegian (Bokmål, Nynorsk, Riksmål) | Germanic | 
| Northeast Malakula | Central Vanuatu | 
| Nǀu | Tuu | 
| Nuer | Nilotic | 
| Nuxálk or Bella Coola | Salishan | 
| Nyabwa | Kru | 
| Nyah Kur | Austroasiatic | 
| Nyangumarta | Pama–Nyungan | 
| Nyoro | Bantu | 
| O | 
| Occitan or Provençal | Romance | 
| Odia | Indo-Aryan | 
| Ojibwe, Ojibwa, or Chippewa | Algonquian | 
| Okinawan | Japonic | 
| Oko-Juwoi | Great Andamanese | 
| Old Leonese or Medieval Leonese | Romance | 
| Old Prussian | Baltic | 
| Omagua | Tupian | 
| Omok | Yukaghir | 
| Ongota | Unclassified language | 
| O'odham | Uto-Aztecan | 
| Ormuri | Iranian | 
| Oroch | Tungusic | 
| Orok | Tungusic | 
| Oromo or Afaan Oromoo | Cushitic | 
| Ossetian or Ossetic | Iranian | 
| Ossetian, Digor | Iranian | 
| Ossetian, Jassic or Jasz | Iranian | 
| Ossetian, Iron | Iranian | 
| Övdalian | Germanic | 
| P | 
| Páez or Nasa Yuwe | Language isolate | 
| Palauan | Malayo-Polynesian | 
| Pame | Oto-Manguean | 
| Pangasinan | Malayo-Polynesian | 
| Papiamento or Papiamentu | Iberian Romance-based creole | 
| Parachi | Iranian | 
| Parthian | Iranian | 
| Parya | Indo-Aryan | 
| Pashto, Pushto, or Pashtu | Iranian | 
| Paya or Pech | Chibchan | 
| Peninsular Japonic | Japonic | 
| Pennsylvania Dutch or Pennsylvania German | Germanic | 
| Persian or farsi, as it is referred to in the Persian language | Iranian | 
| Persian Kowli | Iranian | 
| Phalura | Indo-Aryan | 
| Phoenician | Semitic | 
| Phuthi | Bantu | 
| Picard | Romance | 
| Pipil or Nawat | Uto-Aztecan | 
| Pirahã | Mura | 
| Plautdietsch or Mennonite Low German | Germanic | 
| Podlachian or Podlashuk | Slavic | 
| Polabian | Slavic | 
| Polish | Slavic | 
| Polish Sign Language | DGSic | 
| Pomak | Slavic | 
| Pomeranian | Slavic | 
| Popoloca | Oto-Manguean | 
| Portuguese | Romance | 
| Pothohari or Pahari-Potwari | Indo-Aryan | 
| Pradhan or Pardhan | Dravidian | 
| Praenestinian | Latino-Faliscan | 
| Pucikwar | Great Andamanese | 
| Puelche | Language isolate or Chonan | 
| Puma | Tibeto-Burman | 
| Punic, Phoenicio-Punic, or Carthaginian | Semitic | 
| Punjabi, Panjabi, or Gurmukhi | Indo-Aryan | 
| Purépecha or Tarascan | Language isolate | 
| Q | 
| Q'anjob'al | Mayan | 
| Qashqai or Ghashghai | Turkic | 
| Qatabanian | Semitic | 
| Q'eqchí | Mayan | 
| Quebec Sign Language | Francosign | 
| Quechua | Quechuan | 
| Quelia | German and Russian-based mixed language | 
| R | 
| Rajasthani | Indo-Aryan | 
| Rani | Slavic | 
| Ratagnon, Datagnon, or Latagnun | Bisayan | 
| Razi | Iranian | 
| Razihi | Semitic | 
| Resian | Slavic | 
| Réunion Creole or Bourbonnais | French-based creole | 
| Rijāl Almaʿ | Semitic | 
| Romanian | Romance | 
| Romansh | Romance | 
| Romani | Indo-Aryan | 
| Romani, Balkan | Indo-Aryan | 
| Romani, Baltic | Indo-Aryan | 
| Romani, Bohemian | Indo-Aryan | 
| Romani, Carpathian | Indo-Aryan | 
| Romani, Early | Indo-Aryan | 
| Romani, English | English and British Romani-based mixed language | 
| Romani, Erromintxela | Basque and Kalderash Romani-based mixed language | 
| Romani, Finnish | Indo-Aryan | 
| Romani, Greek | Greek and Romani-based mixed language | 
| Romani, Iberian or Caló | Iberian Romance and Romani-based mixed language | 
| Romani, Kalderash | Indo-Aryan | 
| Romani, Laiuse | Estonian and Finnish Romani-based mixed language | 
| Romani, Rumelian | Indo-Aryan | 
| Romani, Scandinavian | North Germanic and Romani-based mixed language | 
| Romani, Scottish | Scots and British Romani-based mixed language | 
| Romani, Serbian | Serbian and Romani-based mixed language | 
| Romani, Sinte | Indo-Aryan | 
| Romani, Vlax | Indo-Aryan | 
| Romani, Welsh | Indo-Aryan | 
| Romani, Zargari | Indo-Aryan | 
| Romblomanon | Bisayan | 
| Rotokas | East Papuan | 
| Rotuman | Central Pacific | 
| Rouran | Mongolic | 
| Runyankole language or Nyankore | Bantu | 
| Russian | Slavic | 
| Russian, Alaskan | Slavic | 
| Russian, Odesan | Slavic | 
| Russian Sign Language | Francosign | 
| Rusyn, Carpathian | Slavic | 
| Rusyn, Pannonian | Slavic | 
| Rutul | Northeast Caucasian | 
| Ruthenian | Slavic | 
| S | 
| Sabaic or Sabaean | Semitic | 
| Safaitic | Semitic | 
| Salar | Turkic | 
| Samaritan Aramaic | Semitic | 
| Samoan | Malayo-Polynesian | 
| Sandawe | Language isolate | 
| Sango | Ngbandi-based creole | 
| Sanskrit | Indo-Aryan, liturgical language | 
| Santali | Austroasiatic | 
| Sara Bakati' | Land Dayak | 
| Saraiki, Seraiki, or Siraiki Southern Punjabi | Indo-Aryan | 
| Saramaccan | English-based creole | 
| Sardinian | Romance | 
| Sardinian, Campidanese | Romance | 
| Sardinian, Logudorese | Romance | 
| Sarikoli | Iranian | 
| Sart Kalmyk | Mongolic | 
| Saurashtra or Sourashtra | Indo-Aryan | 
| Savi | Indo-Aryan | 
| Sawai | South Halmahera–West New Guinea | 
| Scots | Germanic | 
| Scots, Shetlandic or Shaetlan | Germanic | 
| Scots, Ulster | Germanic | 
| Scottish Gaelic or Scots Gaelic or Gaidhlig or Gaelic | Celtic | 
| Selangor Sign Language | Francosign | 
| Selkup or Ostyak Samoyed | Samoyedic | 
| Semnani | Iranian | 
| Senaya | Semitic | 
| Serbian | Slavic | 
| Serbo-Croatian | Slavic | 
| Sesotho | Bantu | 
| Seto or Setu | Uralic | 
| Seychellois Creole | French-based creole | 
| Shabaki | Iranian | 
| Shan | Kra–Dai | 
| Shelta | Irish and Irish English-based mixed language | 
| Shimaore | Bantu | 
| Shina | Indo-Aryan | 
| Shipibo or Shipibo-Konibo | Panoan | 
| Shona | Bantu | 
| Shor | Turkic | 
| Shoshoni or Shoshone | Uto-Aztecan | 
| Shtokavian | Slavic | 
| Shughni | Iranian | 
| Shumashti | Indo-Aryan | 
| Shuswap or Secwepemctsín | Salishan | 
| Siberian Tatar | Turkic | 
| Sicilian | Romance | 
| Sidamo | Cushitic | 
| Sierra Popoluca or Soteapanec | Mixe–Zoque | 
| Sika | Flores–Lembata | 
| Silesian | Slavic | 
| Silla or Old Korean | Koreanic | 
| Silt'e or Selti or East Gurage | Semitic | 
| Sinacantán | Xincan | 
| Sindhi | Indo-Aryan | 
| Sinhala | Indo-Aryan | 
| Sioux | Siouan | 
| Sivandi | Iranian | 
| Sámi, Akkala | Uralic | 
| Sámi, Inari | Uralic | 
| Sámi, Kainuu | Uralic | 
| Sámi, Kemi | Uralic | 
| Sámi, Kildin | Uralic | 
| Sámi, Lule | Uralic | 
| Sámi, Northern | Uralic | 
| Sámi, Pite | Uralic | 
| Sámi, Skolt | Uralic | 
| Sámi, Southern | Uralic | 
| Sámi, Ter | Uralic | 
| Sámi, Ume | Uralic | 
| Sentinelese | Unclassified language | 
| Slavey | Athabaskan | 
| Slavomolisano | Slavic | 
| Slovak | Slavic | 
| Slovak, Eastern | Slavic | 
| Slovene or Slovenian | Slavic | 
| Slovene, Prekmurje | Slavic | 
| Slovincian | Slavic | 
| Soddo or Kistane | Semitic | 
| Somali | Cushitic | 
| Sonjo or Temi | Bantu | 
| Sonsorolese or Sonsorol | Micronesian | 
| Soqotri | Semitic | 
| Sora | Austroasiatic | 
| Sorbian, Lower | Slavic | 
| Sorbian, Upper | Slavic | 
| Sourashtra | Indo-Aryan | 
| Southern Ndebele | Bantu | 
| South Estonian | Uralic | 
| Spanish | Romance | 
| Spanish, Amazonic | Romance | 
| Spanish, Andalusian | Romance | 
| Spanish, Canarian | Romance | 
| Spanish, Caribbean | Romance | 
| Spanish, Castilian | Romance | 
| Spanish, Catalan | Romance | 
| Spanish, Chilote | Romance | 
| Spanish, Extremaduran or Castúo | Romance | 
| Spanish, Galician or Castrapo | Romance | 
| Spanish, Gibraltarian or Llanito | Romance | 
| Spanish, Mexican | Romance | 
| Spanish, Murcian | Romance | 
| Spanish, Peninsular | Romance | 
| Spanish, Sabine River, Adaeseño Spanish, or Zwolle-Ebarb Spanish | Romance | 
| Spanish, Saharan or Western Saharan Spanish | Romance | 
| Spanish, Standard | Romance | 
| Sranan Tongo | English-based creole | 
| St'at'imcets or Lillooet | Salishan | 
| Sucite or Sìcìté Sénoufo | Senufo | 
| Suba | Bantu | 
| Sundanese | Malayo-Polynesian | 
| Supyire or Supyire Senoufo | Senufo | 
| Suret or Sureth | Semitic | 
| Surigaonon | Bisayan | 
| Susu | Mande | 
| Svan | South Caucasian | 
| Swahili | Bantu | 
| Swati, Swazi, Siswati, or Seswati | Bantu | 
| Swedish | Germanic | 
| Swiss-German Sign Language | Unclassified language, possibly DGSic or Francosign | 
| Syriac | Semitic | 
| T | 
| Taa | Tuu | 
| Tabasaran or Tabassaran | Northeast Caucasian | 
| Tacana | Tacanan | 
| Tachelhit | Berber | 
| Tagalog | Central Philippine | 
| Tahitian | Polynesian | 
| Tai Lue | Kra–Dai | 
| Taíno | Arawakan | 
| Taiwanese Sign Language | JSLic | 
| Tajik | Iranian | 
| Takestani | Iranian | 
| Talysh | Iranian | 
| Tamil | Dravidian | 
| Tanacross | Athabaskan | 
| Tangut | Tibeto-Burman | 
| Taos or Northern Tiwa | Tanoan | 
| Tarahumara | Uto-Aztecan | 
| Tarama | Japonic | 
| Tarifit or Rifi or Riff Berber | Berber | 
| Tat or Tati | Iranian | 
| Tatar | Turkic | 
| Tausug | Bisayan | 
| Taymanitic | Semitic | 
| Tehuelche or Aonikenk | Chon | 
| Telugu | Dravidian | 
| Tetum | Malayo-Polynesian | 
| Tepehua | Totonacan | 
| Tepehuán or O'otham | Uto-Aztecan | 
| Tewa | Tanoan | 
| Thai | Kra–Dai | 
| Thamudic | Semitic | 
| Tharu | Indo-Aryan | 
| Tibetan, Lhasa | Tibetic | 
| Ticuna | Language isolate | 
| Tigre or Xasa | Semitic | 
| Tigrinya | Semitic | 
| Timbisha or Panamint | Uto-Aztecan | 
| Tiv | Tivoid | 
| Tlingit | Na-Dené | 
| Tobian | Micronesian | 
| Toda | Dravidian | 
| Tojolab'al | Mayan | 
| Tok Pisin | English-based creole | 
| Tokelauan | Polynesian | 
| Tol or Jicaque | Jicaquean | 
| Tonga | Bantu | 
| Tongan | Polynesian | 
| Torlakian | Slavic | 
| Torwali or Turvali | Indo-Aryan | 
| Tregami | Indo-Aryan | 
| Trique or Triqui | Oto-Manguean | 
| Tsat | Chamic | 
| Tsez or Dido | Northeast Caucasian | 
| Tshiluba, Luba-Kasai, or Luba-Lulua | Bantu | 
| Tsimshian, Coast | Tsimshianic | 
| Tsimshian, Southern | Tsimshianic | 
| Tsonga | Bantu | 
| Tswana or Setswana | Bantu | 
| Tu or Monguor | Mongolic | 
| Tuareg or Tamasheq | Berber | 
| Tulu | Dravidian | 
| Tumbuka | Bantu | 
| Tupiniquim | Tupian | 
| Turkish | Turkic | 
| Turkish, Cypriot | Turkic | 
| Turkish, Karamanli | Turkic | 
| Turkish, Ottoman | Turkic | 
| Turkish, Tsalka | Turkic | 
| Turkmen | Turkic | 
| Turoyo | Semitic | 
| Tuvaluan | Polynesian | 
| Tuvan Tuvin or Tyvan | Turkic | 
| Tzeltal | Mayan | 
| Tzotzil | Mayan | 
| U | 
| Udihe or Ude or Udege | Tungusic | 
| Udmurt or Votyak | Uralic | 
| Ugaritic | Semitic | 
| Ukrainian | Slavic | 
| Ulada | Malayo-Polynesian | 
| Ulch or Olcha | Tungusic | 
| Unserdeutsch or Rabaul Creole German | German-based creole | 
| Upper Sorbian | Slavic | 
| Urdu | Indo-Aryan | 
| Urum | Turkic | 
| Ute | Uto-Aztecan | 
| Uyghur or Uighur | Turkic | 
| Uzbek | Turkic | 
| V | 
| Vafsi | Iranian | 
| Valencian | Romance | 
| Valencian Sign Language | Catalan Sign | 
| Vasi-vari or Prasuni | Indo-Aryan | 
| Vastese | Romance | 
| Venda or Tshivenda | Bantu | 
| Venetian | Romance | 
| Veps | Uralic | 
| Vietnamese | Austroasiatic | 
| Võro | Uralic | 
| Votic or Votian | Uralic | 
| W | 
| Wa | Austroasiatic | 
| Waddar | Dravidian | 
| Wagiman | Language isolate | 
| Waigali or Kalasha-Ala | Indo-Aryan | 
| Waima or Roro | Malayo-Polynesian | 
| Wakhi | Iranian | 
| Wallisian or East Uvean | Polynesian | 
| Walloon | Romance | 
| Waray or Binisaya | Malayo-Polynesian | 
| Washo | Language isolate | 
| Welsh | Celtic | 
| Western Neo-Aramaic | Semitic | 
| West Polesian or Poleshuk | Slavic | 
| Wolane (Silt'e) | Semitic | 
| Wolof | Niger–Congo | 
| Wymysorys | Germanic | 
| X | 
| Xavante | Jê | 
| Xhosa | Bantu | 
| Xibe or Sibo | Tungusic | 
| Xipaya | Tupian | 
| Y | 
| Yaaku | Afroasiatic | 
| Yaeyama | Japonic | 
| Yaghan or Yámana | Language isolate | 
| Yaghnobi | Iranian | 
| Yakut | Turkic | 
| Yankunytjatjara | Pama–Nyungan | 
| Yanyuwa | Pama–Nyungan | 
| Yapese | Malayo-Polynesian | 
| Yaqui | Uto-Aztecan | 
| Yauma | Bantu | 
| Yavapai | Yuman | 
| Yazdi | Iranian | 
| Yazgulyam or Yazgulami | Iranian | 
| Ye-Maek | Puyŏ? | 
| Yeni | Niger–Congo | 
| Yi language or Nuosu | Tibeto-Burman | 
| Yine or Piro | Arawakan | 
| Yiddish | Germanic | 
| Yidgha | Iranian | 
| Yugur, Eastern | Mongolic | 
| Yugur, Western or Neo-Uygur | Turkic | 
| Yokuts, Yokutsan, or Mariposa | Yokutsan | 
| Yokuts, Buena Vista | Yokutsan | 
| Yokuts, Delta | Yokutsan | 
| Yokuts, Palewyami | Yokutsan | 
| Yokuts, Tule–Kaweah | Yokutsan | 
| Yokuts, Valley | Yokutsan | 
| Yonaguni | Japonic | 
| Yorùbá | Volta–Niger | 
| Younuo | Hmongic | 
| Yucatec Maya | Yucatecan | 
| Yuchi | Language isolate | 
| Yukaghir, Northern or Tundra Yukaghir | Yukaghir | 
| Yukaghir, Southern or Forest Yukaghir | Yukaghir | 
| Yukjin | Koreanic | 
| Yupik | Eskimo–Aleut | 
| Yupiltepeque | Xincan | 
| Yurats | Samoyedic | 
| Yurok | Algic | 
| Z | 
| Záparo | Saparoan | 
| Zapotec | Oto-Manguean | 
| Zaza or Zazaki | Iranian | 
| Zeelandic | Germanic | 
| Zhuang | Kra–Dai | 
| Zoque | Mixe–Zoquean | 
| Zoroastrian Dari | Iranian | 
| Zulu | Bantu | 
| Zuñi or Zuni | Language isolate | 
| Zway or Zay | Semitic |