| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Serbian | Indo-European | српски језик | sr | srp | srp | srp | The ISO 639-2/T code srp deprecated the ISO 639-2/B code scc | |
| Swati | Niger–Congo | SiSwati | ss | ssw | ssw | ssw | also known as Swazi | |
| Southern Sotho | Niger–Congo | Sesotho | st | sot | sot | sot | ||
| Sundanese | Austronesian | Basa Sunda | su | sun | sun | sun | ||
| Swedish | Indo-European | Svenska | sv | swe | swe | swe | ||
| Swahili | Niger–Congo | Kiswahili | sw | swa | swa | swa + 2 | macrolanguage | |
| Tamil | Dravidian | தமிழ் | ta | tam | tam | tam | ||
| Telugu | Dravidian | తెలుగు | te | tel | tel | tel | ||
| Tajik | Indo-European | тоҷикӣ; toçikī; تاجیکی | tg | tgk | tgk | tgk | ||
| Thai | Tai–Kadai | ไทย | th | tha | tha | tha |