The Wainuioru River is a river of the Wellington Region of New Zealand's North Island. A major tributary of the Pahaoa River, it follows a twisting generally southwestward course from its origins 25 kilometres east of Masterton, reaching the Pahaoa 20 kilometres (12 mi) southeast of Martinborough.
"Place Name Detail: Wainuioru River". New Zealand Geographic Placenames Database. Land Information New Zealand. Retrieved 12 July 2009.
Coordinates: 41°16′S 175°41′E / 41.267°S 175.683°E