| Wainuioru River | |
|---|---|
| Location | |
| Country | New Zealand |
| Physical characteristics | |
| Mouth | |
• location | Pahaoa River |
| Length | 46 km (29 mi) |
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.