| East Fork South Fork Crystal River[1] | |
| Source1 Coordinates: | 39.0347°N -107.0011°W |
| Mouth Location: | Confluence with Rock Creek |
| Mouth Coordinates: | 39.0239°N -107.0525°W |
| Progression: | South Fork—Crystal Roaring Fork—Colorado |
| Mouth Elevation: | 10397feet |
East Fork South Fork Crystal River is a tributary of the South Fork Crystal River in Gunnison County, Colorado. The stream's source is on the west side of West Maroon Peak in the Maroon Bells-Snowmass Wilderness. It flows west to a confluence with Rock Creek in the White River National Forest that forms the South Fork Crystal River.