| Southern Waiotauru River | |
| Source1 Location: | Tararua Range |
| Mouth Location: | Waiotauru River |
| Subdivision Type1: | Country |
| Subdivision Name1: | New Zealand |
| Length: | 7km (04miles) |
The Southern Waiotauru River is a river of New Zealand. It joins with the Eastern Waiotauru (Snowy) River to become the Waiotauru River, a tributary of the Ōtaki River.