| South Fork West Mancos River[1] | |
| Source1 Coordinates: | 37.4375°N -108.0839°W |
| Mouth Location: | Confluence with North Fork |
| Mouth Coordinates: | 37.4564°N -108.1469°W |
| Progression: | West Mancos—Mancos San Juan—Colorado |
| Mouth Elevation: | 9186feet |
South Fork West Mancos River is a tributary of the West Mancos River in Montezuma County, Colorado. The river flows from a source in the Owen Basin of the San Juan National Forest to a confluence with the North Fork that forms the West Mancos River.