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Oka (Bithynia), a town of ancient Bithynia, now in Turkey •
Oka, Quebec, Canada, a village •
Oka National Park, near Oka, Quebec •
Oka, Akoko, the capital city of Akoko South-West Local Government of Ondo State, Nigeria •
Oka (river), in the European part of Russia •
Oka (Angara), a river in Siberia, Russia •
Oka, West Virginia, United States, an unincorporated community •
Oca (river), in northern Spain, spelled "Oka" in the Basque language • Igbo spelling of
Awka, a city in Nigeria, capital of Anambra State ==Codes==