Grantham River
| Grantham River | |
|---|---|
| Location | |
| Country | New Zealand | 
| Physical characteristics | |
| Source | |
| • location | Hanmer Range | 
| Mouth | |
 • location  | Waiau Uwha 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 Uwha River, which has its mouth on the Pacific Ocean.
A thermal spring on the river is undeveloped.