Lexington was an 18th-century plantation on Mason's Neck in Fairfax County, Virginia, United States. The estate belonged to several generations of the Mason family, and is now part of Mason Neck State Park. Lexington was originally part of the Gunston Hall plantation land tract, held by various members of the Mason family (one of the First Families of Virginia) for generations, and previously by members of the Doeg band of Native Americans.