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 / Rakahuri 20 kilometres (12 mi) east of Oxford.

Pinchgut hut is located next to the Okuku river.

• List of rivers of New Zealand

43°16′S 172°28′E / 43.267°S 172.467°E / -43.267; 172.467