| Mangawai River | |
| Mouth Location: | Manganui River (Northland) |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Mouth Coordinates: | -36.0156°N 174.2691°W |
| Subdivision Type2: | Region |
| Subdivision Name2: | Northland Region |
Mangawai River should not be confused with Mangawhai River.
The Mangawai River is a small river of the Northland Region of New Zealand.[1] It changes name to the Manganui River (Northland) near to where it is crossed by the North Auckland Line.[2]
The rivers ultimately flow into the Wairoa River (Northland) upstream of Dargaville, before ending in the Kaipara Harbour.[3]