The Okuku River is a river of the north Canterbury Region of New Zealand's South Island. It flows predominantly south from several sources in and close to the eastern edge of the Puketeraki Range west of Waikari, flowing through a steep gorge in the Okuku Range before flowing into the Ashley River 20 kilometres east of Oxford.
"Place Name Detail: Okuku River". New Zealand Geographic Placenames Database. Land Information New Zealand. Retrieved 12 July 2009.
Coordinates: 43°16′S 172°28′E / 43.267°S 172.467°E