Olulumo-Ikom
Oluluyia
Olumarachi
Olumarama
Olunyole
Olusamia
Olushisa
Oluta Popoluca
Olutsotso
Oluwanga
Omagua
Omaha-Ponca
Omani Arabic
Ombamba
Ombo
Omejes
Ometepec Nahuatl
Omi
Ömie
Omok
Omotik
Omurano
Ona
Oneida
Ong
Önge
Onin
Onin Based Pidgin
Oniyan
Onjob
Ono
Onobasulu
Onondaga
Ontenu
Ontong Java
Oorlams
Opao
Opata
Opuuo
Orang Kanaq
Orang Seletar
Oraon Sadri
Orejón
Oring
Oriya (individual language)
Oriya (macrolanguage)
Orizaba Nahuatl
Orma
Ormu
Ormuri
ISO 639-3 Print Names