S
- Saint Kitts and Nevis
- English
- Saint Lucia
- English
- Saint Vincent and the Grenadines
- English
- Samoa
- English (official)
- Samoan (national)
- San Marino
- Italian
- São Tomé and Príncipe
- Portuguese
- Saudi Arabia
- Arabic
- Senegal
- French
- Jola-Fogny (national)
- Mandinka (national)
- Pulaar (national)
- Serer (national)
- Wolof (national)
- Serbia
- Serbian (statewide)
- Albanian (in some municipalities in southern Serbia, Preshevo, Bujanovac, Medveđa)
- Bosniak (in municipalities of Sandzak)
- Croatian (in Vojvodina)
- Hungarian (in Vojvodina)
- Romanian (in Vojvodina)
- Rusyn (in Vojvodina)
- Slovak (in Vojvodina)
- Seychelles
- English
- French
- Seychellois Creole
- Sierra Leone
- English
- Singapore
- English
- Chinese
- Malay
- Tamil
- Slovakia
- Slovak
- Slovenia
- Slovene (statewide)
- Hungarian (minority language in Dobrovnik, Hodoš, and Lendava)
- Italian (minority language in Izola, Koper, and Piran)
- Croatian (minority language in Metlika, Brežice)
- Solomon Islands
- English
- Somalia
- Somali (national).
- Arabic
- South Africa
- Afrikaans
- English
- Southern Ndebele
- Northern Sotho
- Sotho
- Swazi
- Tsonga
- Tswana
- Venda
- Xhosa
- Zulu
-
- (all 11 official, statewide)
- Spain
- Spanish (statewide)
- Catalan (in the Balearic Islands, Catalonia, and Valencia)
- Galician (in Galicia)
- Basque (in Basque Country and Navarre)
- Asturian (recognized minority language in Asturias)
- Occitan (in Catalonia)
- Sri Lanka
- Sinhala
- Tamil
- Sudan
- Arabic
- English
- Suriname
- Dutch
- Swaziland
- English
- Swazi
- Sweden
- Swedish
- Finnish (in Gällivare, Haparanda, Kiruna, Pajala, Övertorneå, and the surrounding areas) (minority language)
- Meänkieli (in Gällivare, Haparanda, Kiruna, Pajala, Övertorneå, and the surrounding areas) (minority language)
- Romani (historical minority language)
- Sami (in Arjeplog, Gällivare, Jokkmokk, Kiruna, and the surrounding areas) (minority language)
- Yiddish (historical minority language)
- Swedish Sign Language (minority language)
- Switzerland
- German (in Aargau, Appenzell Ausserrhoden, Appenzell Innerrhoden, Basel-Landschaft, Basel-Stadt, Bern, Fribourg, Glarus, Graubünden, Lucerne, Nidwalden, Obwalden, Saint Gallen, Schaffhausen, Schwyz, Solothurn, Thurgau, Uri, Valais, Zug, and Zürich)
- French (in Bern, Fribourg, Geneva, Jura, Neuchâtel, Valais, and Vaud)
- Italian (in Ticino and Graubünden)
- Romansh (in Graubünden)
- Syria
- Arabic
Read more about this topic: List Of Official Languages By State