word | | Nationality |
| Islanders | Wallis and Futuna | noun: Wallisian(s), Futunan(s), or Wallis and Futuna Islanders adjective: Wallisian, Futunan, or Wallis and Futuna Islander |
| Israeli | Israel | noun: Israeli(s) adjective: Israeli |
| Italian | Italy | noun: Italian(s) adjective: Italian |
| Ivoirian | Cote d'Ivoire | noun: Ivoirian(s) adjective: Ivoirian |
| Jamaican | Jamaica | noun: Jamaican(s) adjective: Jamaican |
| Japanese | Japan | noun: Japanese (singular and plural) adjective: Japanese |
| Jordanian | Jordan | noun: Jordanian(s) adjective: Jordanian |
| Kazakhstani | Kazakhstan | noun: Kazakhstani(s) adjective: Kazakhstani |
| Kenyan | Kenya | noun: Kenyan(s) adjective: Kenyan |
| Kiribati | Kiribati | noun: I-Kiribati (singular and plural) adjective: I-Kiribati |
| Kittitian | Saint Kitts and Nevis | noun: Kittitian(s), Nevisian(s) adjective: Kittitian, Nevisian |
| Kong | Hong Kong | noun: Chinese/Hong Konger adjective: Chinese/Hong Kong |
| Konger | Hong Kong | noun: Chinese/Hong Konger adjective: Chinese/Hong Kong |
| Korean | Korea, North | noun: Korean(s) adjective: Korean |
| Korean | Korea, South | noun: Korean(s) adjective: Korean |