| Foster Run | |
| Name Other: | Tributary to Sugar Creek |
| Map Size: | 300 |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Foster Run mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Venango |
| Length: | 3.55miles[1] |
| Discharge1 Location: | Sugar Creek |
| Discharge1 Avg: | 3.78cuft/s at mouth with Sugar Creek[2] |
| Source1: | Warden Run divide |
| Source1 Location: | about 1 mile northeast of Hannasville, Pennsylvania[3] |
| Source1 Coordinates: | 41.4908°N -79.9325°W[4] |
| Source1 Elevation: | 1470feet |
| Mouth: | Sugar Creek |
| Mouth Location: | about 0.25 miles north of Wyattville, Pennsylvania |
| Mouth Coordinates: | 41.4547°N -79.8989°W |
| Mouth Elevation: | 1060feet |
| Progression: | southeast |
| River System: | Allegheny River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
Foster Run is a 3.55miles long 1st order tributary to Sugar Creek in Venango County, Pennsylvania.
Foster Run rises on the Warden Run divide about 1 mile northeast of Hannasville, Pennsylvania in Venango County. Foster Run then flows southeast to meet Sugar Creek about 0.25 miles north of Wyattville, Pennsylvania in Venango County.[3]
Foster Run drains of area, receives about 44.0 in/year of precipitation, has a topographic wetness index of 410.34, and has an average water temperature of 8.27 °C.[2] The watershed is 68% forested.[2]