| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| 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 | ||
| Dzongkha | Sino-Tibetan | རྫོང་ཁ | dz | dzo | dzo | dzo | ||
| English | Indo-European | English | en | eng | eng | eng | ||
| Esperanto | Constructed | Esperanto | eo | epo | epo | epo | constructed; initiated from L.L. Zamenhof; 1887 | |
| Estonian | Uralic | eesti; eesti keel | et | est | est | est + 2 | macrolanguage | |
| Ewe | Niger–Congo | Eʋegbe | ee | ewe | ewe | ewe |