word | | Country name |
| form | Israel | conventional long form: State of Israel conventional short form: Israel local long form: Medinat Yisra'el local short form: Yisra'el |
| form | Italy | conventional long form: Italian Republic conventional short form: Italy local long form: Repubblica Italiana local short form: Italia former: Kingdom of Italy |
| form | Jamaica | conventional long form: none conventional short form: Jamaica |
| form | Jan Mayen | conventional long form: none conventional short form: Jan Mayen |
| form | Japan | conventional long form: none conventional short form: Japan local long form: Nihon-koku/Nippon-koku local short form: Nihon/Nippon |
| form | Jersey | conventional long form: Bailiwick of Jersey conventional short form: Jersey |
| form | Jordan | conventional long form: Hashemite Kingdom of Jordan conventional short form: Jordan local long form: Al Mamlakah al Urduniyah al Hashimiyah local short form: Al Urdun former: Transjordan |
| form | Kazakhstan | conventional long form: Republic of Kazakhstan conventional short form: Kazakhstan local long form: Qazaqstan Respublikasy local short form: Qazaqstan former: Kazakh Soviet Socialist Republic |
| form | Kenya | conventional long form: Republic of Kenya conventional short form: Kenya local long form: Republic of Kenya/Jamhuri y Kenya local short form: Kenya former: British East Africa |
| form | Kiribati | conventional long form: Republic of Kiribati conventional short form: Kiribati local long form: Republic of Kiribati local short form: Kiribati note: pronounced keer-ree-bahss former: Gilbert Islands |
| form | 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 |
| form | Korea, South | conventional long form: Republic of Korea conventional short form: South Korea local long form: Taehan-min'guk local short form: Han'guk abbreviation: ROK |
| form | Kosovo | conventional long form: Republic of Kosovo conventional short form: Kosovo local long form: Republika e Kosoves (Republika Kosova) local short form: Kosova (Kosovo) former: Kosovo and Metohija Autonomous Province |
| form | Kuwait | conventional long form: State of Kuwait conventional short form: Kuwait local long form: Dawlat al Kuwayt local short form: Al Kuwayt |
| form | Kyrgyzstan | conventional long form: Kyrgyz Republic conventional short form: Kyrgyzstan local long form: Kyrgyz Respublikasy local short form: Kyrgyzstan former: Kirghiz Soviet Socialist Republic |
| form | Laos | conventional long form: Lao People's Democratic Republic conventional short form: Laos local long form: Sathalanalat Paxathipatai Paxaxon Lao local short form: none |
| form | Latvia | conventional long form: Republic of Latvia conventional short form: Latvia local long form: Latvijas Republika local short form: Latvija former: Latvian Soviet Socialist Republic |
| form | Lebanon | conventional long form: Lebanese Republic conventional short form: Lebanon local long form: Al Jumhuriyah al Lubnaniyah local short form: Lubnan former: Greater Lebanon |
| form | Lesotho | conventional long form: Kingdom of Lesotho conventional short form: Lesotho local long form: Kingdom of Lesotho local short form: Lesotho former: Basutoland |
| form | Liberia | conventional long form: Republic of Liberia conventional short form: Liberia |