The Mōkihinui River is a river located on the West Coast of New Zealand's South Island, about 40 kilometres north of Westport. Meridian Energy had proposed the Mokihinui Hydro project on the river in 2007 but it was cancelled in May 2012. In 2019, it was announced that large parts of the river catchment, including 15 km of river bed, would be added to Kahurangi National Park. The New Zealand Ministry for Culture and Heritage gives a translation of "large flax-stalk raft" for Mōkihinui. Since 2019 the official name of the river has been spelled with a macron.