Obolo
Ocaina
Ogea
Oium
Ojibway: Southern
Ojibwe: Saulteaux
oKela
Okrika
Oksapmin
Olo
oluHanga
oluLuyia
Omie
oMyene
oMyene: Mpongwe
Ono
Onobasulu
Ora
Orejon
Oriya
Oriya: Adiwasi
Orokaiva
Orokolo
Oromo: Central
Oromo: Eastern
Oromo: Western
Orya
oshiKwanyama
oshiNdonga
Ossete
oTetela
otjiDhimba
otjiHerero
otjiKwambi
Otomi: Eastern
Otomi: Mezquital
Otomi: San Felipe Santiago
Otomi: Tenango
Otomi: Western
Ottawa
Owininga