The Wainui River is a river of the Northland Region of New Zealand's North Island.

It flows generally northeast from its sources at the eastern end of the Maungataniwha Range to reach the Oruaiti River five kilometres southwest of the Whangaroa Harbour.

"Place name detail: Wainui River".

Land Information New Zealand.

This article about a river in the Northland Region is a stub.