Oku or OKU may refer to: * Oku, Cameroon, subdivision in the Northwest Region of Cameroon ** Lake Oku, a crater lake on the Bamenda Plateau in the Northwest Region of Cameroon ** Mount Oku, the largest volcano in the Oku Massif, in the Cameroon Volcanic Line * Oku language, a Grassfields Bantu language of Cameroon * Oku people (Sierra Leone), an ethnic group of Yoruba descent in Sierra Leone. * Ökü, a village in Azerbaijan * Oku District, Okayama, a former district located in Okayama Prefecture, Japan ** Oku, Okayama, a former town in the district, merged with other towns to create the city of Setouchi * Oku (surname), a common Japanese surname * Princess Ōku (661–702), a Japanese princess during the Asuka period in Japanese history *OKU, IATA Airport Code for Mokuti Lodge Airport in Namibia * Ogan Komering Ulu Regency, a province in South Sumatra, Indonesia

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