| Kaihu River | |
| Mouth Location: | Wairoa River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 38km (24miles) |
The Kaihu River is a river of the far north of New Zealand's North Island. It flows southeast from just south of Waipoua Forest, reaching the Wairoa River at the town of Dargaville.