|Main source||Hanmer Range|
|River mouth||Waiau River|
The Grantham River is a river in the Canterbury region of New Zealand. It arises in the Hanmer Range near Mount Miromiro, in the Hanmer Forest Park, and flows south-east into the Waiau River, which has its mouth on the Pacific Ocean.
A thermal spring on the river is undeveloped.
- Peter Dowling (editor) (2004). Reed New Zealand Atlas. Reed Books. pp. map 71. ISBN 0-7900-0952-8.
- White, Brian (14 July 2006). "An Assessment of Geothermal Direct Heat Use in New Zealand" (PDF). New Zealand Geothermal Association. p. 28. Retrieved 16 July 2009.
- Land Information New Zealand - Search for Place Names
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