The Ōpatu River is a tidal creek of the Kaipara Harbour, in the Auckland Region of New Zealand's North Island. It flows west from Te Pahi Stream, before joining another tidal creek of the harbour, the Tauhoa River.

• List of rivers of New Zealand

• "Place name detail: Opatu River". New Zealand Gazetteer. New Zealand Geographic Board. Retrieved 12 July 2009.