Oak Hill is a suburban unincorporated community located in Fairfax County, Virginia, United States.

The town of Herndon lies immediately to the north, while the unincorporated community of Chantilly is adjacent to Oak Hill in the south.

Franklin Farm, Floris and McNair are census-designated places located within the larger Oak Hill community.

), and adjacent park were named after Crossfield in honor of his active mind, commitment to education, and contributions to aeronautical science.

Charles Burlingame, pilot of the doomed American Airlines Flight 77 aircraft which was crashed by terrorists into the Pentagon during the September 11, 2001 attacks, resided in Oak Hill before his death.