| Estrella River | |
| Pushpin Map: | USA California |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the Estrella River in California |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | California |
| Subdivision Type3: | Region |
| Subdivision Name3: | San Luis Obispo County |
| Length: | 28.5miles |
| Source1: | Confluence of Cholame Creek and San Juan Creek |
| Source1 Location: | Shandon |
| Source1 Coordinates: | 35.6558°N -120.3703°W |
| Mouth: | Salinas River |
| Mouth Location: | San Miguel |
| Mouth Coordinates: | 35.7417°N -120.6925°W |
The Estrella River is a 28.5adj=midNaNadj=mid[1] tributary river in eastern San Luis Obispo County, California. The river forms at the confluence of Cholame Creek, from the north, and San Juan Creek, from the south, near the town of Shandon. From there it flows west-northwest to its confluence with the Salinas River, of which it is a tributary, 8 miles (12.8 km) north of Paso Robles. Cholame Creek has its headwaters on the southwest side of Middle Mountain and its tributary, Little Cholame Creek, begins on the northeast side. The creek drains the Cholame Valley, which is bordered by Diablo Range on the east and Cholame Hills, a northern extension of the Temblor Range, on the west. The average precipitation in the area ranges from 11to, increasing northward.
A portion of the Temblor Range drains into San Juan Creek, but the nearby Carrizo Plain has been cut off from the watershed by tectonic action. The creek also drains part of the La Panza Range in the southwest of the watershed. The vast majority of the land in the watershed is rangeland, but there is also some cropland, pastureland and developed areas.