| Winterton River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | Marlborough |
| Length: | 150NaN0 |
| Source1: | Inland Kaikoura Range |
| Source1 Coordinates: | -41.045°N 173.5561°W |
| Mouth: | Awatere River |
| Mouth Coordinates: | -41.9539°N 173.5269°W |
| Mouth Elevation: | 545-1NaN-1 |
| Progression: | Winterton River → Awatere River |
The Winterton River is a river of the Marlborough Region of New Zealand's South Island. It flows generally north from the Inland Kaikoura Range to reach the Awatere River 30km (20miles) northeast of Molesworth Station.