| Mangamuka River | |
| Source1 Location: | Maungataniwha Range |
| Mouth Location: | Hokianga Harbour |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 22km (14miles) |
The Mangamuka River is a river of the far north of the Northland Region of New Zealand's North Island. It flows generally south from the Maungataniwha Range southeast of Kaitaia, and the last few kilometres of its length are a wide, silty arm of the Hokianga Harbour, which it reaches 10km (10miles) northeast of Rawene.