Flat Branch is a 2.92 mi (4.70 km) long 2nd order tributary to the Fisher River in Surry County, North Carolina.

Flat Branch rises on the Red Hill Creek and Mitchell River divides about 2 miles southwest of Blevins Store, North Carolina.

Flat Branch then flows generally east to join the Fisher River about 2 miles southeast of Blevins Store.

[2] Flat Branch drains 2.52 square miles (6.5 km2) of area, receives about 49.2 in/year of precipitation, has a wetness index of 340.91, and is about 63% forested.

This article related to a river in North Carolina is a stub.