| Waihī River | |
| Subdivision Type1: | Country |
| Length: | 42km (26miles) |
| Mouth Coordinates: | -44.063°N 171.244°W |
The Waihī River is a river of the south Canterbury region of New Zealand's South Island. It flows southeast from its sources in the Four Peaks Range, flowing through the town of Geraldine to reach the Ōpihi River close to Temuka.