word | | Country name |
| Kitts | Saint Kitts and Nevis | conventional long form: Federation of Saint Kitts and Nevis conventional short form: Saint Kitts and Nevis former: Federation of Saint Christopher and Nevis |
| KKTC | Cyprus | ... Kibris note: the Turkish Cypriot community, which administers the northern part of the island, refers to itself as the "Turkish Republic of Northern Cyprus" or "TRNC" (Kuzey Kibris Turk Cumhuriyeti or KKTC |
| ko | Fiji | conventional long form: Republic of Fiji conventional short form: Fiji local long form: Republic of Fiji/Matanitu ko Viti local short form: Fiji/Viti |
| koku | Japan | conventional long form: none conventional short form: Japan local long form: Nihon-koku/Nippon-koku local short form: Nihon/Nippon |
| Komori | Comoros | ... conventional long form: Union of the Comoros conventional short form: Comoros local long form: Udzima wa Komori (Comorian); Union des Comores (French); Jumhuriyat al Qamar al Muttahidah (Arabic) local short form: Komori ... |
| Kong | Hong Kong | conventional long form: Hong Kong Special Administrative Region conventional short form: Hong Kong official long form: Xianggang Tebie Xingzhengqu official short form: Xianggang abbreviation: HK |
| Kongeriget | Denmark | conventional long form: Kingdom of Denmark conventional short form: Denmark local long form: Kongeriget Danmark local short form: Danmark |
| Kongeriket | Norway | conventional long form: Kingdom of Norway conventional short form: Norway local long form: Kongeriket Norge local short form: Norge |
| konghwaguk | Korea, North | conventional long form: Democratic People's Republic of Korea conventional short form: North Korea local long form: Choson-minjujuui-inmin-konghwaguk local short form: Choson abbreviation: DPRK |
| Koninkrijk | Belgium | conventional long form: Kingdom of Belgium conventional short form: Belgium local long form: Royaume de Belgique/Koninkrijk Belgie local short form: Belgique/Belgie |
| Koninkrijk | Netherlands | conventional long form: Kingdom of the Netherlands conventional short form: Netherlands local long form: Koninkrijk der Nederlanden local short form: Nederland |