| Styx River | |
| Mouth Location: | Waiau Toa / Clarence River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 70NaN0 |
| Pushpin Map: | New Zealand |
| Pushpin Map Caption: | Location of the mouth within New Zealand |
Styx River is in the north of the Canterbury region of New Zealand. It flows east for 7km (04miles) into the Waiau Toa / Clarence River, 9km (06miles) north west of Hanmer Springs.