Gary Brent Darnell (born October 15, 1948) is a former American football player and coach at the college level. Darnell is native of Arkansas and an alumnus of Oklahoma State University, where he played college football. A long-time defensive coordinator, Darnell was also previously the head coach at Western Michigan University and Tennessee Technological University, as well as the interim head coach at the University of Florida and Texas A&M University.