Okuku River is a river in the Canterbury region of the South Island of New Zealand.
It flows mostly to the south, starting from small rivers near the Puketeraki Range (on the eastern side). This area is west of the town of Waikari.
The river goes through a steep gorge in the Okuku Range, then joins the Ashley River about 20 kilometres (12 miles) east of Oxford, New Zealand.
Pinchgut Hut is a hut located next to the Okuku River. It is a place where hikers and visitors can stay.
