Sinhala
Sinhalese
Sininkere
Sinsauru
Sinyar
Sio
Siona
Sipacapense
Sira
Siraya
Siri
Siriano
Sirionó
Sirmauri
Siroi
Sisaala, Tumulung
Sisaala, Western
Sîshëë
Sissala
Sissano
Siuslaw
Sivandi
Sivia Sign Language
Siwai
Siwi
Siwu
Skagit
Skalvian
Skou
Slave (Athapascan)
Slavey, North
Slavey, South
Slavic, Church
Slavomolisano
Slavonic, Church
Slavonic, Old
Slavonic, Old Church
Slovak
Slovakian Sign Language
Slovenian
Snohomish
Sô
So'a
Sobei
So (Democratic Republic of Congo)
Soga
Sogdian
Soi
Sok
Sokoro
ISO 639-3 Inverted Names