| Thurso River | |
| Native Name: | Maori: Ōtehika |
| Pushpin Map: | New Zealand#New Zealand South Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Thurso River |
| Source1: | Mount Pembroke |
| Source1 Coordinates: | -44.5653°N 167.8743°W |
| Mouth Location: | Tasman Sea |
| Mouth Elevation: | 0m (00feet) |
| Mouth Coordinates: | -44.5642°N 167.8206°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Progression: | Thurso River → Tasman Sea |
The Thurso River (also known as Ōtehika) is a river in northern Fiordland, New Zealand. It rises west of Mount Pembroke and flows westward into the Tasman Sea north of Milford Sound.