| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Kikuyu | Gikuyu | Niger–Congo | Gĩkũyũ | ki | kik | kik | kik | |
| Central Khmer | Austroasiatic | ខ្មែរ; ខេមរភាសា; ភាសាខ្មែរ | km | khm | khm | khm | also known as Khmer or Cambodian | |
| Kazakh | Turkic | қазақ тілі | kk | kaz | kaz | kaz | ||
| Kanuri | Nilo-Saharan | Kanuri | kr | kau | kau | kau + 3 | macrolanguage | |
| Georgian | South Caucasian | ქართული | ka | kat | geo | kat | ||
| Kashmiri | Indo-European | कश्मीरी; كشميري | ks | kas | kas | kas | ||
| Kannada | Dravidian | ಕನ್ನಡ | kn | kan | kan | kan | ||
| Kalaallisut | Greenlandic | Eskimo–Aleut | kalaallisut; kalaallit oqaasii | kl | kal | kal | kal | |
| Japanese | Japonic | 日本語 (にほんご) | ja | jpn | jpn | jpn | ||
| Javanese | Austronesian | ꦧꦱꦗꦮ; Basa Jawa | jv | jav | jav | jav |