word | | Country name |
| Islands | Spratly Islands | conventional long form: none conventional short form: Spratly Islands |
| Islands | Tonga | conventional long form: Kingdom of Tonga conventional short form: Tonga local long form: Pule'anga Tonga local short form: Tonga former: Friendly Islands |
| Islands | Turks and Caicos Islands | conventional long form: none conventional short form: Turks and Caicos Islands abbreviation: TCI |
| Islands | Tuvalu | ... form: none conventional short form: Tuvalu local long form: none local short form: Tuvalu former: Ellice Islands note: "Tuvalu" means "group of eight," referring to the country's eight traditionally inhabited islands |
| Islands | United States Pacific Island Wildlife Refuges | conventional long form: none conventional short form: Baker Island; Howland Island; Jarvis Island; Johnston Atoll; Kingman Reef; Midway Islands; Palmyra Atoll |
| Islands | Virgin Islands | conventional long form: United States Virgin Islands conventional short form: Virgin Islands former: Danish West Indies abbreviation: USVI |
| Islands | Wallis and Futuna | conventional long form: Territory of the Wallis and Futuna Islands conventional short form: Wallis and Futuna local long form: Territoire des Iles Wallis et Futuna local short form: Wallis et Futuna |
| Islas | Falkland Islands (Islas Malvinas) | conventional long form: none conventional short form: Falkland Islands (Islas Malvinas) |
| Isle | Isle of Man | conventional long form: none conventional short form: Isle of Man abbreviation: I.O.M. |
| Israel | Israel | conventional long form: State of Israel conventional short form: Israel local long form: Medinat Yisra'el local short form: Yisra'el |
| Issas | Djibouti | ... long form: Republic of Djibouti conventional short form: Djibouti local long form: Republique de Djibouti/Jumhuriyat Jibuti local short form: Djibouti/Jibuti former: French Territory of the Afars and Issas, French Somaliland |