rra Leone
conventional short form: Sierra Leone
local long form: Republic of Sierra Leone
local short form: Sierra Leone

Singapore
conventional long form: Republic of Singapore
conventional short form: Singapore
local long form: Republic of Singapore
local short form: Singapore

Slovakia
conventional long form: Slovak Republic
conventional short form: Slovakia
local long form: Slovenska Republika
local short form: Slovensko

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

Solomon Islands
conventional long form: none
conventional short form: Solomon Islands
local long form: none
local short form: Solomon Islands
former: British Solomon Islands

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

South Africa
conventional long form: Republic of South Africa
conventional short form: South Africa
former: Union of South Africa
abbreviation: RSA

South Georgia and the South Sandwich Islands
conventional long form:
South Georgia and the South Sandwich Islands
conventional short form: none
abbreviation: SGSSI

Spain
conventional long form: Kingdom of Spain
conventional short form: Spain
local long form: Reino de Espana
local short form: Espana

Spratly Islands
conventional long form: none
conventional short form: Spratly Islands

Sri Lanka
conventional long form: Democratic 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

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

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

Svalbard
conventional long form: none
conventional short form: Svalb