word | | Country name |
| form | Ireland | conventional long form: none conventional short form: Ireland local long form: none local short form: Eire |
| form | Isle of Man | conventional long form: none conventional short form: Isle of Man abbreviation: I.O.M. |
| 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 ya Kenya local short form: Kenya former: British East Africa |