| Longs Run | |
| Name Other: | Tributary to Buffalo Creek |
| Map Size: | 300 |
| Pushpin Map: | USA West Virginia#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Longs Run mouth |
| Pushpin Map Alt: | Map of Longs Run mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | West Virginia |
| Subdivision Type3: | County |
| Subdivision Name3: | Brooke Ohio |
| Length: | 3.88miles[1] |
| Discharge1 Location: | Castleman Run |
| Discharge1 Avg: | 6.06cuft/s at mouth with Castleman Run[2] |
| Source1: | McGraw Run divide |
| Source1 Location: | about 2 miles south-southeast of West Liberty, West Virginia |
| Source1 Coordinates: | 40.1403°N -80.5792°W[3] |
| Source1 Elevation: | 1195feet[4] |
| Mouth: | Castleman Run |
| Mouth Location: | about 2 miles south-southeast of Bethany, West Virginia |
| Mouth Coordinates: | 40.1764°N -80.5406°W |
| Mouth Elevation: | 879feet[5] |
| Progression: | Castleman Run → Buffalo Creek → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Ohio River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | WV 37, Long Run Road, WV 53, Castleman Run Road |
Longs Run is a 3.88miles long 2nd order tributary to Castleman Run in Brooke County, West Virginia.
Longs Run rises about 2 miles south-southeast of West Liberty, West Virginia, in Ohio County and then flows northeasterly into Brooke County to join Castleman Run about 2 miles south-southeast of Bethany, West Virginia.[5]
Longs Run drains of area, receives about 40.5 in/year of precipitation, has a wetness index of 293.77, and is about 60% forested.[2]