Blue Ridge Summit is an unincorporated community and census-designated place in Franklin County, Pennsylvania, United States, southwest of Gettysburg in the central part of the state, adjoining Pennsylvania's southern border with Maryland. It is less than 3 miles east of Pen Mar, Maryland. The population of Blue Ridge Summit was 887 at the 2020 census. The community was the birthplace of Wallis Simpson, the wife of Prince Edward, Duke of Windsor.