| Billy J. Murphy | |
| Birth Date: | 13 January 1921 |
| Birth Place: | Lorenzo, Texas, U.S. |
| Death Place: | Memphis, Tennessee, U.S. |
| Player Years1: | 1941–1942 |
| Player Team1: | Mississippi State |
| Player Years2: | 1946 |
| Player Team2: | Mississippi State |
| Player Positions: | Halfback |
| Coach Years1: | 1947–1951 |
| Coach Team1: | Memphis State (backfield) |
| Coach Years2: | 1952–1953 |
| Coach Team2: | Mississippi State (backfield) |
| Coach Years3: | 1954–1957 |
| Coach Team3: | Minnesota (backfield) |
| Coach Years4: | 1958–1971 |
| Coach Team4: | Memphis State |
| Admin Years1: | 1966–1981 |
| Admin Team1: | Memphis State |
| Overall Record: | 91–44–1 |
| Bowl Record: | 1–0 |
| Championships: | 3 MVC (1968–1969, 1971) |
| Cfbhof Year: | 2022 |
| Cfbhof Id: | 2499 |
Billy Jack "Spook" Murphy (January 13, 1921 – February 21, 2008) was an American college football player, coach, and athletics administrator. He served as the head football coach at Memphis State University—now known as the University of Memphis—from 1958 to 1971, compiling a record of 91–44–1. Murphy's 1963 team was the school's first undefeated team in 25 years, and Murphy was named national coach of the year. Murphy was also the athletic director at Memphis State from 1966 to 1981. He grew up in Siloam Springs, Arkansas and played college football at Mississippi State University.
Murphy met all eligibility requirements and was first on the 2007 College Football Hall of Fame ballot. In 2022, he was inducted.[1]
Murphy died in a retirement community in Memphis, Tennessee in 2008.[2] [3]