Simeku
Simeulue
Simte
Sinagen
Sinasina
Sinaugoro
Sindarin
Sindhi
Sindhi Bhil
Sindihui Mixtec
Singa
Singapore Sign Language
Singpho
Sinhala
Sinicahua Mixtec
Sininkere
Sinsauru
Sinte Romani
Sinyar
Sio
Siona
Sipacapense
Sira
Siraya
Sirenik Yupik
Siri
Siriano
Sirionó
Sirmauri
Siroi
Sissala
Sissano
Siuslaw
Sivandi
Sivia Sign Language
Siwai
Siwi
Siwu
Siyin Chin
Skagit
Skalvian
Skepi Creole Dutch
Skolt Sami
Skou
Slave (Athapascan)
Slavomolisano
Slovak
Slovakian Sign Language
Slovenian
Small Flowery Miao
ISO 639-3 Reference Names