| Pearson River | |
| Pushpin Map: | New Zealand South Island#New Zealand |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Ngatau River |
| Source1: | Pearson Saddle |
| Source1 Coordinates: | -44.3062°N 168.8401°W |
| Mouth Location: | Waiatoto River |
| Mouth Coordinates: | -44.2961°N 168.7882°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Subdivision Type2: | Region |
| Subdivision Name2: | West Coast |
| Subdivision Type3: | District |
| Subdivision Name3: | Westland |
| Length: | 50NaN0 |
| Progression: | Pearson River → Waiatoto River → Jackson Bay / Okahu → Tasman Sea |
| Tributaries Left: | Jimmy Creek |
The Pearson River is a river of the West Coast region of New Zealand's South Island. It flows west from Pearson Saddle immediately to the south of Mount Taurus, before joining the Waiatoto River after a distance of roughly .