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K
| Language name | Native name | Code |
|---|---|---|
| Kabardian | Адыгэбзэ | KBD |
| Kabyle | Taqbaylit | KAB |
| Kachin; Jingpho | Jingpho, Marip | KAC |
| Kalaallisut; Greenlandic | Kalaallisut, Kalaallit Oqaasii | KAL |
| Kalmyk; Oirat | Хальмг Келн | XAL |
| Kamba | - | KAM |
| Kannada | ಕನ್ನಡ | KAN |
| Kanuri | - | KAU |
| Kara-Kalpak | Қарақалпақ Тили | KAA |
| Karachay-Balkar | Къарачай-Малкъар Тил | KRC |
| Karelian | Karjalan Kieli | KRL |
| Karen languages | - | KAR |
| Kashmiri | कॉशुर, کٲشُر | KAS |
| Kashubian | Kaszëbsczi Jãzëk | CSB |
| Kawi | Bhāṣa Kawi | KAW |
| Kazakh | Қазақ Тілі | KAZ |
| Khasi | Khasi | KHA |
| Khoisan languages | - | KHI |
| Khotanese; Sakan | - | KHO |
| Kikuyu; Gikuyu | Gĩkũyũ | KIK |
| Kimbundu | - | KMB |
| Kinyarwanda | Kinyarwanda | KIN |
| Kirghiz; Kyrgyz | Кыргыз Тили | KIR |
| Klingon; tlhIngan-Hol | Tlhingan Hol | TLH |
| Komi | Коми Кыв | KOM |
| Kongo | Kikongo | KON |
| Konkani | कॊंकणि | KOK |
| Korean | 한국어 , 조선말 | KOR |
| Kosraean | Kosrae | KOS |
| Kpelle | Kpele | KPE |
| Kru languages | - | KRO |
| Kuanyama; Kwanyama | - | KUA |
| Kumyk | Кумык | KUM |
| Kurdish | Kurdî | KUR |
| Kurukh | - | KRU |
| Kutenai | Ktunaxa | KUT |