word | | Nationality |
| Tuvaluan | Tuvalu | noun: Tuvaluan(s) adjective: Tuvaluan |
| Ugandan | Uganda | noun: Ugandan(s) adjective: Ugandan |
| Ukrainian | Ukraine | noun: Ukrainian(s) adjective: Ukrainian |
| Uruguayan | Uruguay | noun: Uruguayan(s) adjective: Uruguayan |
| US | American Samoa | noun: American Samoan(s) (US nationals) adjective: American Samoan |
| US | Guam | noun: Guamanian(s) (US citizens) adjective: Guamanian |
| US | Northern Mariana Islands | noun: NA (US citizens) adjective: NA |
| US | Puerto Rico | noun: Puerto Rican(s) (US citizens) adjective: Puerto Rican |
| US | Virgin Islands | noun: Virgin Islander(s) (US citizens) adjective: Virgin Islander |
| used | Kosovo | noun: Kosovar (Albanian), Kosovac (Serbian) adjective: Kosovar (Albanian), Kosovski (Serbian) note: Kosovan, a neutral term, is sometimes also used as a noun or adjective |
| Uzbekistani | Uzbekistan | noun: Uzbekistani adjective: Uzbekistani |
| Vanuatu | Vanuatu | noun: Ni-Vanuatu (singular and plural) adjective: Ni-Vanuatu |
| Venezuelan | Venezuela | noun: Venezuelan(s) adjective: Venezuelan |
| Verdean | Cape Verde | noun: Cape Verdean(s) adjective: Cape Verdean |
| Vietnamese | Vietnam | noun: Vietnamese (singular and plural) adjective: Vietnamese |