C
- Cameroon Pidgin
- Caribbean Javanese
- Cashibo-Cacataibo
- Catalan
- Central Kanuri
- Central Kurdish
- Central Mazahua
- Central Pame
- Central Pashto
- Central Siberian Yupik
- Central Subanen
- Central Tarahumara
- Central Yupik
- Chadian Arabic
- Chaldean Neo-Aramaic
- Chechen
- Cheke Holo
- Chicahuaxtla Triqui
- Chilcotin
- Chimborazo Highland Quichua
- Chinese
- Choctaw
- Chokwe
- Chol
- Chuj
- Chuukese
- Chuwabu
- Citak
- Classical Nahuatl
- Classical Syriac
- Copainalá Zoque
- Crimean Tatar
- Croatian
- Cuyonon
- Czech
K
- K'iche'
- Kabyle
- Kachin
- Kafa
- Kahua
- Kaingang
- Kalmyk
- Kamano
- Kambera
- Kankanaey
- Kannada
- Kaqchikel
- Kara-Kalpak
- Karbi
- Kare (Central African Republic)
- Kâte
- Kayaw
- Kazakh
- Keapara
- Kekchí
- Kele (Democratic Republic of Congo)
- Kera
- Khakas
- Khmer
- Kikuyu
- Kilivila
- Kinyarwanda
- Kipsigis
- Kirghiz
- Kituba (Congo)
- Kongo
- Koonzime
- Korean
- Kosena
- Kouya
- Kovai
- Kpelle
- Kriol
- Kumyk
- Kuria
- Kutep
- Kuy
- Kwara'ae
- Kwasio
M
- Maasina Fulfulde
- Macedonian
- Maiadomu
- Mailu
- Mairasi
- Mal
- Malagasy
- Malay
- Malayalam
- Maltese
- Mam
- Mampruli
- Mandinka
- Manga Kanuri
- Manikion
- Mano
- Manya
- Maori
- Mapos Buang
- Marathi
- Marshallese
- Martu Wangka
- Maru
- Masai
- Mashco Piro
- Matya Samo
- Mbandja
- Mbe
- Medumba
- Mekeo
- Mende (Sierra Leone)
- Meru
- Meyah
- Mezquital Otomi
- Miahuatlán Zapotec
- Misima-Panaeati
- Mískito
- Mitla Zapotec
- Modern Greek
- Moken
- Mono (Solomon Islands)
- Moru
- Mossi
- Muna
- Musey
- Mussau-Emira
S
- Sa'a
- Samoan
- San Blas Kuna
- San Mateo Del Mar Huave
- San Miguel El Grande Mixtec
- Sanga (Democratic Republic of Congo)
- Sangir
- Sango
- Sanskrit
- Santali
- Sapo
- Sar
- Saramaccan
- Saxwe Gbe
- Sayula Popoluca
- Sena
- Serbian
- Shan
- Shilluk
- Shipibo-Conibo
- Shona
- Shughni
- Sierra de Juárez Zapotec
- Sinasina
- Sinaugoro
- Sindhi
- Sinhala
- Slovak
- Slovenian
- Somali
- South Bolivian Quechua
- South Slavey
- Southern Balochi
- Southern Bobo Madaré
- Southern Pashto
- Southern Samo
- Southern Sotho
- Southern Subanen
- Spanish
- Sranan Tongo
- Standard Arabic
- Sundanese
- Swahili
- Swati
- Swedish
T
- Tabasco Chontal
- Tae'
- Tagalog
- Tagbanwa
- Tahaggart Tamahaq
- Tahitian
- Tai Dam
- Taita
- Tajik
- Tamil
- Taroko
- Tase Naga
- Tausug
- Tboli
- Tedim Chin
- Telugu
- Tenango Otomi
- Tepeuxila Cuicatec
- Tereno
- Tetela
- Tetelcingo Nahuatl
- Tezoatlán Mixtec
- Thai
- Tibetan
- Tiv
- Tlahuitoltepec Mixe
- Tojolabal
- Tok Pisin
- Tonga (Tonga Islands)
- Tonga (Zambia)
- Toraja-Sa'dan
- Toro So Dogon
- Tsonga
- Tsou
- Tswa
- Tumbuka
- Turkana
- Turkish
- Turkmen
- Tuvalu
- Tuvan
- Tzeltal
- Tzotzil