Frank Heyling Furness (November 12, 1839 - June 27, 1912) was an American architect of the Victorian era. He designed more than 600 buildings, most in the Philadelphia area, and is remembered for his eclectic, muscular, often idiosyncratically scaled buildings, and for his influence on the Chicago architect Louis Sullivan. Furness was also a Medal of Honor recipient for his bravery during the Civil War.