Hybla Valley is a census-designated place (CDP) located in Fairfax County, Virginia, within the United States. It is situated south of Alexandria.
According to the 2010 census, the population of Hybla Valley was 15,801. This figure represented a decrease from the 16,721 residents recorded in 2000, a change attributed to a reduction in area as several eastward neighborhoods, including much of Hollin Hills, were moved to the Fort Hunt CDP. By the 2020 census, the population had increased to 16,319.