word | | Country name |
| form | Swaziland | conventional long form: Kingdom of Swaziland conventional short form: Swaziland local long form: Umbuso weSwatini local short form: eSwatini |
| form | Sweden | conventional long form: Kingdom of Sweden conventional short form: Sweden local long form: Konungariket Sverige local short form: Sverige |
| form | 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 ... |
| form | 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) |
| form | Taiwan | conventional long form: none conventional short form: Taiwan local long form: none local short form: Taiwan former: Formosa |
| form | 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 |
| form | 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 |
| form | Thailand | conventional long form: Kingdom of Thailand conventional short form: Thailand local long form: Ratcha Anachak Thai local short form: Prathet Thai former: Siam |
| form | Timor-Leste | conventional long form: Democratic Republic of Timor-Leste (pronounced TEE-mor LESS-tay) conventional short form: Timor-Leste local long form: Republika Demokratika Timor Lorosa'e [Tetum]; Republica Democratica de Timor-Leste ... |