Harold Jefferson Davall (May 5, 1879 – November 21, 1931) was an American college football player and coach, engineer, and railroad supervisor. He served as the head football coach at West Virginia University in 1902 and the College of William & Mary in 1903, compiling a career college football coaching record of 8–7. Born in Camden, New Jersey, Davall played football as an End at Cornell University before graduating with an engineering degree.