| Cornplanter Run | |
| Name Other: | Tributary to Oil Creek |
| Map Size: | 300 |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Cornplanter Run mouth location |
| Pushpin Map Alt: | Location of the mouth of Cornplanter Run |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Venango |
| Subdivision Type4: | City |
| Subdivision Name4: | Oil City |
| Length: | 2.75miles[1] |
| Discharge1 Location: | Cornplanter Township, Pennsylvania |
| Discharge1 Avg: | 5.99cuft/s at mouth with Oil Creek[2] |
| Source1: | about 1.5 miles north of Oil City, Pennsylvania |
| Source1 Location: | Oil City, Pennsylvania |
| Source1 Coordinates: | 41.4733°N -79.7342°W[3] |
| Source1 Elevation: | 1480feet |
| Mouth: | Just outside of north city limits of Oil City, Pennsylvania |
| Mouth Location: | Oil City, Pennsylvania |
| Mouth Coordinates: | 41.4442°N -79.6997°W |
| Mouth Elevation: | 1005feet |
| Progression: | Oil Creek → Allegheny River → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Allegheny River |
| Tributaries Left: | Calaboose Run |
| Tributaries Right: | unnamed tributaries |
| Bridges: | N Seneca Street |
Cornplanter Run is a 2.76adj=midNaNadj=mid[4] tributary to Oil Creek in northwestern Pennsylvania in the United States.
Cornplanter Run rises just south of Fosters Corner and flows south to join Oil Creek just north of the city limits of Oil City, Pennsylvania.
Calaboose Run joins this creek about half-way through its course on the left.
Cornplanter Run is a second order stream at its mouth with Oil Creek.[5]
Cornplanter Run drains 3.3 square miles (8.45 square km) and has an average annual flow of 5.99 cfs (cubic feet/second).
Rainfall averages 44.53 inches (1,130.99 mm) per year. About 83% of the watershed is forested.[5]