The Mangatangi River, or Mangatangi Stream, originates on the eastern slopes of the Hunua Ranges in New Zealand and flows roughly southwards until it is joined by the just north of State Highway 2 between Mangatawhiri and Maramarua, where it becomes the Maramarua River. Mangatangi can be translated as manga tangi to stream of weeping, or as rippling stream, or babbling brook.