Flat Rock is a historic plantation house located near Kenbridge, Lunenburg County, Virginia. The house was built in several sections during the first half of the 19th century. It is a two-story, three-bay frame structure flanked by one-story, one-bay wings. The oldest portion likely dates to about 1797. It has a side-gable roof and features two massive exterior end chimneys of brick and granite. Also on the property are the contributing smokehouse and a mid-19th-century monument to Henry H. Chambers (1790–1826), son of an owner of Flat Rock and later a U.S. Senator from Alabama, who is buried here where he died en route to Washington.

It was listed on the National Register of Historic Places in 1979.