Frank Riley Castleman (March 17, 1877 – October 9, 1946) was an American football and baseball player, track athlete, and coach in multiple sports. He competed for the United States in the 200 metre hurdles at the 1904 Summer Olympics held in St. Louis, Missouri, where he won the silver medal. Castleman was a member of the Greater New York Irish American Athletic Association, which became the Irish American Athletic Club. He competed mainly in the 200 metre hurdles. Castleman graduated from Colgate University in 1906.