Hollin Hills is a neighborhood in Hybla Valley, Virginia, though much of the neighborhood (east of Elba Road and Rebecca Drive) was transferred to the Fort Hunt CDP for census purposes before 2010. The community abuts the Villamay and Mason Hill neighborhoods, just south of Alexandria in the South Alexandria section of Fairfax County, Virginia. Today, the neighborhood is known primarily for its mid-century modern architecture, which remains very cohesive because of a design review committee that advises on building or modification of existing houses.