word | | Country name |
| former | Slovenia | conventional long form: Republic of Slovenia conventional short form: Slovenia local long form: Republika Slovenija local short form: Slovenija former: People's Republic of Slovenia, Socialist Republic of Slovenia |
| former | Solomon Islands | conventional long form: none conventional short form: Solomon Islands local long form: none local short form: Solomon Islands former: British Solomon Islands |
| former | Somalia | conventional long form: none conventional short form: Somalia local long form: Jamhuuriyada Demuqraadiga Soomaaliyeed local short form: Soomaaliya former: Somali Republic, Somali Democratic Republic |
| former | South Africa | conventional long form: Republic of South Africa conventional short form: South Africa former: Union of South Africa abbreviation: RSA |
| former | Sri Lanka | ... Socialist Republic of Sri Lanka conventional short form: Sri Lanka local long form: Shri Lamka Prajatantrika Samajaya di Janarajaya/Ilankai Jananayaka Choshalichak Kutiyarachu local short form: Shri Lamka/Ilankai former: Serendib, Ceylon |
| former | Sudan | conventional long form: Republic of the Sudan conventional short form: Sudan local long form: Jumhuriyat as-Sudan local short form: As-Sudan former: Anglo-Egyptian Sudan |
| former | Suriname | conventional long form: Republic of Suriname conventional short form: Suriname local long form: Republiek Suriname local short form: Suriname former: Netherlands Guiana, Dutch Guiana |
| former | 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) |
| former | Taiwan | conventional long form: none conventional short form: Taiwan local long form: none local short form: Taiwan former: Formosa |
| former | 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 |
| former | 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 |