| Mangatu River | |
| Mouth Location: | Waipaoa River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 24km (15miles) |
The Mangatu River is a river of the Gisborne Region of New Zealand's North Island. It flows south from its sources in rough hill country northeast of Matawai to reach the Waipaoa River at Whatatutu.