word | | Country name |
| South | Namibia | conventional long form: Republic of Namibia conventional short form: Namibia local long form: Republic of Namibia local short form: Namibia former: German Southwest Africa, South-West Africa |
| South | South Africa | conventional long form: Republic of South Africa conventional short form: South Africa former: Union of South Africa abbreviation: RSA |
| South | South Georgia and the South Sandwich Islands | conventional long form: South Georgia and the South Sandwich Islands conventional short form: none abbreviation: SGSSI |
| South | Yemen | ... long form: Al Jumhuriyah al Yamaniyah local short form: Al Yaman former: Yemen Arab Republic [Yemen (Sanaa) or North Yemen] and People's Democratic Republic of Yemen [Yemen (Aden) or South Yemen |
| Southern | French Southern and Antarctic Lands | conventional long form: Territory of the French Southern and Antarctic Lands conventional short form: French Southern and Antarctic Lands local long form: Territoire des Terres Australes et Antarctiques Francaises local short form ... |
| Southern | Zimbabwe | conventional long form: Republic of Zimbabwe conventional short form: Zimbabwe former: Southern Rhodesia, Rhodesia |
| Southwest | Namibia | conventional long form: Republic of Namibia conventional short form: Namibia local long form: Republic of Namibia local short form: Namibia former: German Southwest Africa, South-West Africa |
| Sovereign | Akrotiri | conventional long form: Akrotiri Sovereign Base Area conventional short form: Akrotiri |
| Sovereign | Dhekelia | conventional long form: Dhekelia Sovereign Base Area conventional short form: Dhekelia |
| Soviet | Armenia | conventional long form: Republic of Armenia conventional short form: Armenia local long form: Hayastani Hanrapetut'yun local short form: Hayastan former: Armenian Soviet Socialist Republic, Armenian Republic |
| Soviet | Azerbaijan | conventional long form: Republic of Azerbaijan conventional short form: Azerbaijan local long form: Azarbaycan Respublikasi local short form: Azarbaycan former: Azerbaijan Soviet Socialist Republic |
| Soviet | Belarus | conventional long form: Republic of Belarus conventional short form: Belarus local long form: Respublika Byelarus' local short form: Byelarus' former: Belorussian (Byelorussian) Soviet Socialist Republic |
| Soviet | Estonia | conventional long form: Republic of Estonia conventional short form: Estonia local long form: Eesti Vabariik local short form: Eesti former: Estonian Soviet Socialist Republic |
| Soviet | Georgia | conventional long form: none conventional short form: Georgia local long form: none local short form: Sak'art'velo former: Georgian Soviet Socialist Republic |
| Soviet | Kazakhstan | conventional long form: Republic of Kazakhstan conventional short form: Kazakhstan local long form: Qazaqstan Respublikasy local short form: Qazaqstan former: Kazakh Soviet Socialist Republic |
| Soviet | Kyrgyzstan | conventional long form: Kyrgyz Republic conventional short form: Kyrgyzstan local long form: Kyrgyz Respublikasy local short form: Kyrgyzstan former: Kirghiz Soviet Socialist Republic |
| Soviet | Latvia | conventional long form: Republic of Latvia conventional short form: Latvia local long form: Latvijas Republika local short form: Latvija former: Latvian Soviet Socialist Republic |
| Soviet | Lithuania | conventional long form: Republic of Lithuania conventional short form: Lithuania local long form: Lietuvos Respublika local short form: Lietuva former: Lithuanian Soviet Socialist Republic |
| Soviet | Moldova | conventional long form: Republic of Moldova conventional short form: Moldova local long form: Republica Moldova local short form: Moldova former: Moldavian Soviet Socialist Republic, Moldovan Soviet Socialist Republic |
| Soviet | Russia | conventional long form: Russian Federation conventional short form: Russia local long form: Rossiyskaya Federatsiya local short form: Rossiya former: Russian Empire, Russian Soviet Federative Socialist Republic |
| Soviet | 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 |
| Soviet | Turkmenistan | conventional long form: none conventional short form: Turkmenistan local long form: none local short form: Turkmenistan former: Turkmen Soviet Socialist Republic |