word | | Country name |
| conventional | Svalbard | conventional long form: none conventional short form: Svalbard (sometimes referred to as Spitzbergen) |
| conventional | Swaziland | conventional long form: Kingdom of Swaziland conventional short form: Swaziland local long form: Umbuso weSwatini local short form: eSwatini |
| conventional | Sweden | conventional long form: Kingdom of Sweden conventional short form: Sweden local long form: Konungariket Sverige local short form: Sverige |
| conventional | Switzerland | conventional long form: Swiss Confederation conventional short form: Switzerland local long form: Schweizerische Eidgenossenschaft (German); Confederation Suisse (French); Confederazione Svizzera (Italian); Confederaziun Svizra (Romansh) local short form: Schweiz (German); Suisse (French); Svizzera ... |
| conventional | Syria | conventional long form: Syrian Arab Republic conventional short form: Syria local long form: Al Jumhuriyah al Arabiyah as Suriyah local short form: Suriyah former: United Arab Republic (with Egypt) |
| conventional | Taiwan | conventional long form: none conventional short form: Taiwan local long form: none local short form: T'ai-wan former: Formosa |
| conventional | Tajikistan | conventional long form: Republic of Tajikistan conventional short form: Tajikistan local long form: Jumhurii Tojikiston local short form: Tojikiston former: Tajik Soviet Socialist Republic |
| conventional | Tanzania | conventional long form: United Republic of Tanzania conventional short form: Tanzania local long form: Jamhuri ya Muungano wa Tanzania local short form: Tanzania former: United Republic of Tanganyika and Zanzibar |
| conventional | Thailand | conventional long form: Kingdom of Thailand conventional short form: Thailand local long form: Ratcha Anachak Thai local short form: Prathet Thai former: Siam |
| conventional | Timor-Leste | conventional long form: Democratic Republic of Timor-Leste conventional short form: Timor-Leste local long form: Republika Demokratika Timor Lorosa'e [Tetum]; Republica Democratica de Timor-Leste [Portuguese] local short form: Timor ... |
| conventional | Togo | conventional long form: Togolese Republic conventional short form: Togo local long form: Republique Togolaise local short form: none former: French Togoland |
| conventional | Tokelau | conventional long form: none conventional short form: Tokelau |
| conventional | Tonga | conventional long form: Kingdom of Tonga conventional short form: Tonga local long form: Pule'anga Tonga local short form: Tonga former: Friendly Islands |
| conventional | Trinidad and Tobago | conventional long form: Republic of Trinidad and Tobago conventional short form: Trinidad and Tobago |
| conventional | Tunisia | conventional long form: Tunisian Republic conventional short form: Tunisia local long form: Al Jumhuriyah at Tunisiyah local short form: Tunis |
| conventional | Turkey | conventional long form: Republic of Turkey conventional short form: Turkey local long form: Turkiye Cumhuriyeti local short form: Turkiye |
| conventional | Turkmenistan | conventional long form: none conventional short form: Turkmenistan local long form: none local short form: Turkmenistan former: Turkmen Soviet Socialist Republic |
| conventional | Turks and Caicos Islands | conventional long form: none conventional short form: Turks and Caicos Islands abbreviation: TCI |
| conventional | Tuvalu | conventional long 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 ... |
| conventional | Uganda | conventional long form: Republic of Uganda conventional short form: Uganda |
| conventional | Ukraine | conventional long form: none conventional short form: Ukraine local long form: none local short form: Ukrayina former: Ukrainian National Republic, Ukrainian State, Ukrainian Soviet Socialist Republic |