William Clark Jarnagin (May 24, 1914 – October 19, 1979) was an American football and basketball coach.
[1] He served as the interim head football coach at Hardin–Simmons University during the 1943 Sun Bowl.
Jarnigan was the head football coach at West Texas State University—now known as West Texas A&M University—from 1958 to 1959.
[2] He was also the head basketball coach at Hardin–Simmons during the 1942–43 season.
[3] # denotes interim head coach