| Waitutu River | |
| Pushpin Map: | New Zealand#New Zealand South Island |
| Pushpin Map Size: | 270px |
| Pushpin Map Caption: | Mouth of the Waitutu River |
| Source1: | Lake Poteriteri |
| Source1 Coordinates: | -46.1828°N 167.0923°W |
| Source1 Elevation: | 30m (100feet) |
| Mouth Location: | Foveaux Strait |
| Mouth Elevation: | 0m (00feet) |
| Mouth Coordinates: | -46.2413°N 167.0672°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 27km (17miles) |
| Progression: | Waitutu River → Foveaux Strait |
The Waitutu River is a river in southern Fiordland, New Zealand. It is the outlet of Lake Poteriteri to the sea.