| Flat Branch | |
| Name Other: | Tributary to Hyco River |
| Map Size: | 300 |
| Pushpin Map: | USA Virginia#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Flat Branch mouth |
| Pushpin Map Alt: | Map of Flat Branch mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Virginia |
| Subdivision Type3: | County |
| Subdivision Name3: | Halifax |
| Length: | 1.11miles[1] |
| Discharge1 Location: | Hyco River |
| Discharge1 Avg: | 0.66cuft/s at mouth with Hyco River[2] |
| Source1: | Morris Branch divide |
| Source1 Location: | about 1.5 miles west of Aarons Creek, Virginia |
| Source1 Coordinates: | 36.6564°N -78.7472°W[3] |
| Source1 Elevation: | 398feet[4] |
| Mouth: | Hyco River at John H. Kerr Reservoir |
| Mouth Location: | about 1 mile northwest of Aarons Creek, Virginia |
| Mouth Coordinates: | 36.6731°N -78.7408°W |
| Mouth Elevation: | 300feet |
| Progression: | Hyco River → Dan River → Roanoke River → Albemarle Sound |
| River System: | Roanoke River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | US 58 |
Flat Branch is a 1.11miles long 1st order tributary to the Hyco River in Halifax County, Virginia. Flat Branch joins Hyco River in John H. Kerr Reservoir (Buggs Island Reservoir in Virginia).
Flat Branch rises about 1.5 miles west of Aarons Creek, Virginia and then flows north-northeast to join the Hyco River in John H. Kerr Reservoir about 1 mile northwest of Aarons Creek.[4]
Flat Branch drains of area, receives about 45.4 in/year of precipitation, has a wetness index of 410.39, and is about 70% forested.[2]