| 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 | ||
| Sinhala | Sinhalese | Indo-European | සිංහල | si | sin | sin | sin | |
| Sango | Creole | yângâ tî sängö | sg | sag | sag | sag | ||
| Northern Sami | Uralic | Davvisámegiella | se | sme | sme | sme | ||
| Sindhi | Indo-European | सिन्धी; سنڌي، سندھی | sd | snd | snd | snd | ||
| Sardinian | Indo-European | sardu | sc | srd | srd | srd + 4 | macrolanguage | |
| Sanskrit | Indo-European | संस्कृतम् | sa | san | san | san | ancient; still spoken; also known as Saṃskṛta | |
| Kinyarwanda | Niger–Congo | Ikinyarwanda | rw | kin | kin | kin | ||
| Russian | Indo-European | русский | ru | rus | rus | rus | ||
| Romanian | Moldavian;Moldovan | Indo-European | Română | ro | ron | rum | ron | The identifiers mo and mol are deprecated; leaving ro and ron (639-2/T) and rum (639-2/B) the current language identifiers to be used for the variant of the Romanian language also known as Moldavian and Moldovan in English and moldave in French. The identifiers mo and mol will not be assigned to different items; and recordings using these identifiers will not be invalid. |