Flat Rock is a census-designated place (CDP) in Surry County, North Carolina, United States.

The name "Flat Rock" stems from the community's granite quarry.

According to the United States Census Bureau, the CDP has a total area of 2.6 square miles (6.7 km2), all land.

There were 754 housing units at an average density of 285.3 per square mile (110.2/km2).

28.6% of all households were made up of individuals, and 14.5% had someone living alone who was 65 years of age or older.