Oro
Oroch
'Ôrôê
Oroha
Orok
Orokaiva
Oroko
Orokolo
Oromo
Oroqen
Orowe
Oro Win
Oruma
Orya
Osage
Osatu
Oscan
Osing
Ososo
Ossetian
Ossetic
Otank
Ot Danum
Oti
Otoro
Ottawa
Ottoman Turkish (1500-1928)
Otuho
Otuke
Ouma
Oune
Övdalian
Owa
Owenia
Owiniga
Oy
Oya'oya
Oyda
Oyster Bay Tasmanian
Ozolotepec Zapotec
Ozumacín Chinantec
Pa'a
Pááfang
Paakantyi
Paama
Paasaal
Pacahuara
Pacaraos Quechua
Pacific Gulf Yupik
Pacoh
ISO 639-3 Print Names