| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Slovak | Indo-European | Slovenčina; Slovenský Jazyk | sk | slk | slo | slk | ||
| Slovenian | Indo-European | Slovenski Jezik; Slovenščina | sl | slv | slv | slv | also known as Slovene | |
| Northern Sami | Uralic | Davvisámegiella | se | sme | sme | sme | ||
| Samoan | Austronesian | gagana fa'a Samoa | sm | smo | smo | smo | ||
| Shona | Niger–Congo | chiShona | sn | sna | sna | sna | ||
| Sindhi | Indo-European | सिन्धी; سنڌي، سندھی | sd | snd | snd | snd | ||
| Somali | Afro-Asiatic | Soomaaliga; af Soomaali | so | som | som | som | ||
| Southern Sotho | Niger–Congo | Sesotho | st | sot | sot | sot | ||
| Spanish | Castilian | Indo-European | Español | es | spa | spa | spa | |
| Sardinian | Indo-European | sardu | sc | srd | srd | srd + 4 | macrolanguage |