| Cato River | |
| Mouth: | Ñuble River |
| Mouth Location: | North of Chillán, Chile |
| Mouth Coordinates: | -36.5517°N -72.0846°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Chile |
The Cato River is a river in Ñuble Region in the southern portion of Central Chile. It joins the Ñuble River about 1 km to the east of Chile Route 5. Close to its mouth is the city of Chillán.