| Willow Run | |
| Name Other: | Tributary to Husbands Run |
| Map Size: | 180 |
| Pushpin Map: | Delaware#USA |
| Pushpin Map Size: | 180 |
| Pushpin Map Caption: | Location of Willow Run mouth |
| Pushpin Map Alt: | Map of Willow Run mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Delaware |
| Subdivision Type3: | County |
| Subdivision Name3: | New Castle |
| Discharge1 Location: | Husbands Run |
| Source1: | Shellpot Creek divide |
| Source1 Location: | Sharpley, Delaware[1] |
| Source1 Coordinates: | 39.7986°N -75.5497°W[2] |
| Source1 Elevation: | 338feet |
| Mouth: | Husbands Run |
| Mouth Location: | about 0.5 miles east of Fairfax, Delaware[3] |
| Mouth Coordinates: | 39.7872°N -75.5608°W |
| Mouth Elevation: | 285feet |
| Progression: | southwest |
| River System: | Delaware River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | Sharpley Road, Country Club Drive |
Willow Run is a 1st order tributary to Husbands Run in New Castle County, Delaware.
Willow Run rises in Sharpley, Delaware,[1] and then flows southwest through Woodbrook and the DuPont Country Club, where it joins Husbands Run about 0.5 miles east of Fairfax.[3]