| Bo Hagan | |
| Birth Date: | 8 October 1925 |
| Birth Place: | Savannah, Georgia, U.S. |
| Death Place: | Greenville, South Carolina, U.S. |
| Player Sport1: | Football |
| Player Years2: | 1946–1949 |
| Player Team2: | South Carolina |
| Player Sport3: | Baseball |
| Player Years4: | 1947 |
| Player Team4: | South Carolina |
| Player Years5: | 1949–1950 |
| Player Team5: | South Carolina |
| Player Years6: | 1952 |
| Player Team6: | Jesup Bees |
| Player Positions: | Quarterback (football) |
| Coach Sport1: | Football |
| Coach Years2: | 1951–1953 |
| Coach Team2: | Georgia Tech (freshmen) |
| Coach Years3: | 1954–1955 |
| Coach Team3: | SMU (backfield) |
| Coach Years4: | 1956–1966 |
| Coach Team4: | Rice (backfield) |
| Coach Years5: | 1967–1970 |
| Coach Team5: | Rice |
| Admin Years1: | 1967–1970 |
| Admin Team1: | Rice |
| Admin Years2: | 1975–1976 |
| Admin Team2: | South Carolina |
| Overall Record: | 12–27–1 |
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.
Hagan was a high school football coach in Atlanta before serving as freshmen football coach at the Georgia Tech under Bobby Dodd from 1951 to 1953. He moved to Southern Methodist University in 1954, where he worked for two seasons as backfield coach with Woody Woodard. In 1956, Jess Neely hired Hagan as his backfield coach at Rice University. He assisted Neely for 11 seasons before succeeding him as head coach after the 1966 campaign.[1]