Elroy Bert Coan III (born July 2, 1940 in Timpson, Texas) is a former American football player. He is most notable because of his extraordinary speed (9.4 in the 100-yard dash) and size (6'4", 215 lbs) and because he was the central figure in a dispute over the 1960 college football game between the University of Kansas Jayhawks and the University of Missouri Tigers, the second-longest-running rivalry in college football (known as the "Border War"). Coan played for Kansas - and helped the Jayhawks win the 1960 game by a score of 23-7 over Missouri, then-ranked #1. But later, the Big 8 declared Coan ineligible, due to a recruiting violation by Bud Adams while Coan was still at Texas Christian University (TCU) and the game was forfeited. Missouri (and the Big 8) considers the 1960 game a victory for Missouri, while Kansas (and the NCAA) count the game as a Kansas victory. Ever since, the two universities have disputed the overall win-loss record in the long-running series.
Coan went on to play in 72 games in seven seasons in the American Football League; the first season with the San Diego Chargers, and the rest with the Kansas City Chiefs.