| Mangawai River | |
| Mouth Location: | Wairoa River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | Northland Region |
The Mangawai River is a river of the Northland Region of New Zealand. It flows east into the Wairoa River close to its outflow into the Kaipara Harbour.