Bull Run Mountains Natural Area Preserve is a 2,486-acre (10.06 km2) Natural Area Preserve located along the Bull Run Mountains in Fauquier and Prince William counties, Virginia. Dedicated in 2002, the majority of the preserve is owned and operated by the Virginia Outdoors Foundation (VOF). It harbors a number of outstanding natural community types, some of which are rare in the Commonwealth. There are also quartzite cliffs and boulder fields around High Point Mountain within the preserve's boundaries.