word | | Nationality |
| Solomon | Solomon Islands | noun: Solomon Islander(s) adjective: Solomon Islander |
| Somali | Somalia | noun: Somali(s) adjective: Somali |
| sometimes | 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 |
| South | South Africa | noun: South African(s) adjective: South African |
| Spaniard | Spain | noun: Spaniard(s) adjective: Spanish |
| Spanish | Spain | noun: Spaniard(s) adjective: Spanish |
| Sri | Sri Lanka | noun: Sri Lankan(s) adjective: Sri Lankan |
| Sudanese | Sudan | noun: Sudanese (singular and plural) adjective: Sudanese |
| Surinamer | Suriname | noun: Surinamer(s) adjective: Surinamese |
| Surinamese | Suriname | noun: Surinamer(s) adjective: Surinamese |
| Swazi | Swaziland | noun: Swazi(s) adjective: Swazi |
| Swede | Sweden | noun: Swede(s) adjective: Swedish |
| Swedish | Sweden | noun: Swede(s) adjective: Swedish |
| Swiss | Switzerland | noun: Swiss (singular and plural) adjective: Swiss |
| Syrian | Syria | noun: Syrian(s) adjective: Syrian |
| Taiwan | Taiwan | noun: Taiwan (singular and plural) note: example - he or she is from Taiwan; they are from Taiwan adjective: Taiwan |
| Tajikistani | Tajikistan | noun: Tajikistani(s) adjective: Tajikistani |
| Tanzanian | Tanzania | noun: Tanzanian(s) adjective: Tanzanian |
| term | 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 |
| Thai | Thailand | noun: Thai (singular and plural) adjective: Thai |
| Timorese | Timor-Leste | noun: Timorese adjective: Timorese |
| Tobagonian | Trinidad and Tobago | noun: Trinidadian(s), Tobagonian(s) adjective: Trinidadian, Tobagonian |
| Togolese | Togo | noun: Togolese (singular and plural) adjective: Togolese |
| Tokelauan | Tokelau | noun: Tokelauan(s) adjective: Tokelauan |
| Tomean | Sao Tome and Principe | noun: Sao Tomean(s) adjective: Sao Tomean |
| Tongan | Tonga | noun: Tongan(s) adjective: Tongan |
| Trinidadian | Trinidad and Tobago | noun: Trinidadian(s), Tobagonian(s) adjective: Trinidadian, Tobagonian |
| Tunisian | Tunisia | noun: Tunisian(s) adjective: Tunisian |
| Turk | Turkey | noun: Turk(s) adjective: Turkish |
| Turkish | Turkey | noun: Turk(s) adjective: Turkish |
| Turkmen | Turkmenistan | noun: Turkmen(s) adjective: Turkmenistani |
| Turkmenistani | Turkmenistan | noun: Turkmen(s) adjective: Turkmenistani |