Belle Haven is a census-designated place in Fairfax County, Virginia, United States. Nearby CDPs are Huntington, Groveton and Fort Hunt. The population of Belle Haven was 6,851 at the 2020 census. The CDP is located just south of Old Town Alexandria and bounded on the west by Richmond Highway and on the east by the Potomac River. It encompasses Belle Haven, a wealthy subdivision dating from the 1920s, and several adjoining neighborhoods.