| Brannon Run | |
| Name Other: | Tributary to Allegheny River |
| Map Size: | 300 |
| Map Alt: | Map of the mouth of Brannon Run |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Alt: | Location of the mouth of Brannon 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: | Reno |
| Length: | 2.93miles[1] |
| Discharge1 Location: | Allegheny River |
| Discharge1 Avg: | 4.04cuft/s at mouth with Allegheny River[2] |
| Source1: | Read Run divide |
| Source1 Location: | about 2 miles northwest of Oil City, Pennsylvania |
| Source1 Coordinates: | 41.4467°N -79.745°W[3] |
| Source1 Elevation: | 1490feet[4] |
| Mouth: | Allegheny River |
| Mouth Location: | Reno, Pennsylvania |
| Mouth Coordinates: | 41.4117°N -79.7564°W |
| Mouth Elevation: | 972feet[5] |
| Progression: | south and southwest |
| River System: | Allegheny River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | US 62 |
Brannon Run is a 2.93miles long 1st order tributary to the Allegheny River in Venango County, Pennsylvania.
Brannon Run rises about 2 miles northwest of Oil City, Pennsylvania, and then flows south and southwest to join the Allegheny River at Reno.[5]
Brannon Run drains of area, receives about 44.4 in/year of precipitation, and has a wetness index of 357.00 and is about 77% forested.[2]