| Country | Nationality |
| Spain | noun: Spaniard(s) adjective: Spanish |
| Spratly Islands | void |
| Sri Lanka | noun: Sri Lankan(s) adjective: Sri Lankan |
| Sudan | noun: Sudanese (singular and plural) adjective: Sudanese |
| Suriname | noun: Surinamer(s) adjective: Surinamese |
| Svalbard | void |
| Swaziland | noun: Swazi(s) adjective: Swazi |
| Sweden | noun: Swede(s) adjective: Swedish |
| Switzerland | noun: Swiss (singular and plural) adjective: Swiss |
| Syria | noun: Syrian(s) adjective: Syrian |
| Taiwan | noun: Taiwan (singular and plural) note: example - he or she is from Taiwan; they are from Taiwan adjective: Taiwan |
| Tajikistan | noun: Tajikistani(s) adjective: Tajikistani |
| Tanzania | noun: Tanzanian(s) adjective: Tanzanian |
| Thailand | noun: Thai (singular and plural) adjective: Thai |
| Timor-Leste | noun: Timorese adjective: Timorese |
| Togo | noun: Togolese (singular and plural) adjective: Togolese |
| Tokelau | noun: Tokelauan(s) adjective: Tokelauan |
| Tonga | noun: Tongan(s) adjective: Tongan |
| Trinidad and Tobago | noun: Trinidadian(s), Tobagonian(s) adjective: Trinidadian, Tobagonian |
| Tunisia | noun: Tunisian(s) adjective: Tunisian |
| Turkey | noun: Turk(s) adjective: Turkish |
| Turkmenistan | noun: Turkmen(s) adjective: Turkmenistani |
| Turks and Caicos Islands | noun: none adjective: none |
| Tuvalu | noun: Tuvaluan(s) adjective: Tuvaluan |
| Uganda | noun: Ugandan(s) adjective: Ugandan |
| Ukraine | noun: Ukrainian(s) adjective: Ukrainian |
| United Arab Emirates | noun: Emirati(s) adjective: Emirati |
| United Kingdom | noun: Briton(s), British (collective plural) adjective: British |
| United States | noun: American(s) adjective: American |
| United States Pacific Island Wildlife Refuges | void |
| Uruguay | noun: Uruguayan(s) adjective: Uruguayan |
| Uzbekistan | noun: Uzbekistani adjective: Uzbekistani |
| Vanuatu | noun: Ni-Vanuatu (singular and plural) adjective: Ni-Vanuatu |
| Venezuela | noun: Venezuelan(s) adjective: Venezuelan |
| Vietnam | noun: Vietnamese (singular and plural) adjective: Vietnamese |
| Virgin Islands | noun: Virgin Islander(s) (US citizens) adjective: Virgin Islander |
| Wake Island | void |
| Wallis and Futuna | noun: Wallisian(s), Futunan(s), or Wallis and Futuna Islanders adjective: Wallisian, Futunan, or Wallis and Futuna Islander |
| West Bank | noun: NA adjective: NA |
| Western Sahara | noun: Sahrawi(s), Sahraoui(s) adjective: Sahrawi, Sahrawian, Sahraouian |
| World | void |
| Yemen | noun: Yemeni(s) adjective: Yemeni |
| Zambia | noun: Zambian(s) adjective: Zambian |
| Zimbabwe | noun: Zimbabwean(s) adjective: Zimbabwean |