| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Chinese | Sino-Tibetan | 中文 (Zhōngwén); 汉语; 漢語 | zh | zho | chi | zho + 13 | macrolanguage | |
| Church Slavic | Church Slavonic;Old Church Slavonic;Old Slavonic;Old Bulgarian | Indo-European | ѩзыкъ словѣньскъ | cu | chu | chu | chu | ancient; in use by Orthodox Church |
| Chuvash | Turkic | чӑваш чӗлхи | cv | chv | chv | chv | ||
| Cornish | Indo-European | Kernewek | kw | cor | cor | cor | ||
| Corsican | Indo-European | corsu; lingua corsa | co | cos | cos | cos | ||
| Cree | Algonquian | ᓀᐦᐃᔭᐍᐏᐣ | cr | cre | cre | cre + 6 | macrolanguage | |
| Croatian | Indo-European | hrvatski jezik | hr | hrv | hrv | hrv | ||
| Czech | Indo-European | čeština; český jazyk | cs | ces | cze | ces | ||
| Danish | Indo-European | dansk | da | dan | dan | dan | ||
| Divehi | Dhivehi;Maldivian | Indo-European | ދިވެހި | dv | div | div | div |