| Name | Other Name | Family | Nativ Name | ISO6391 Code | ISO6392T Code | ISO6392B Code | ISO6393 Code | Notes |
|---|---|---|---|---|---|---|---|---|
| Sardinian | Indo-European | sardu | sc | srd | srd | srd + 4 | macrolanguage | |
| 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 | |
| Sundanese | Austronesian | Basa Sunda | su | sun | sun | sun | ||
| Swahili | Niger–Congo | Kiswahili | sw | swa | swa | swa + 2 | macrolanguage | |
| Swedish | Indo-European | Svenska | sv | swe | swe | swe | ||
| Tahitian | Austronesian | Reo Tahiti | ty | tah | tah | tah | One of the Reo Mā`ohi (languages of French Polynesia) | |
| Tamil | Dravidian | தமிழ் | ta | tam | tam | tam | ||
| Tatar | Turkic | татар теле; tatar tele | tt | tat | tat | tat | ||
| Telugu | Dravidian | తెలుగు | te | tel | tel | tel |