Harold Benjamin "Bo" Hagan (October 8, 1925 – January 22, 2002) was an American football and baseball player, football coach, and college athletics administrator. He served as head football coach at Rice University from 1967 from 1970, compiling a record of 12–27–1. Before serving as head coach, Hagan was the backfield coach at Rice for 11 seasons. Hagan was the athletic director at the University of South Carolina from 1975 to 1976.