Donnie Duncan was an American football coach and college athletics administrator. He served as the head football coach at Iowa State University from 1979 to 1982, compiling a record of 18–24–2. His 1980 and 1981 Cyclones squads both made appearances in the national rankings. The 1981 Cyclones began the season at 5–1–1 and rose to No. 11 in the AP Poll. Led by future National Football League (NFL) players Dwayne Crutchfield, Dan Johnson, Karl Nelson and Chris Washington, the Cyclones tied No. 5 Oklahoma (7–7) and downed No. 8 Missouri (34–13).