The Mārahau River is a river of the Tasman Region, New Zealand. The river originated on the eastern slopes of Mount Evans in the Abel Tasman National Park, and flows south-east towards Sandy Bay, a bay of Tasman Bay, north of the village of Mārahau.

• List of rivers of New Zealand

• "Place name detail: Mārahau River". New Zealand Gazetteer. New Zealand Geographic Board. Retrieved 12 July 2009.