Theodore John "Ted" Cottrell (born June 13, 1947 in Chester, Pennsylvania) is the former head coach for the New York Sentinels of the United Football League. Previously he was the defensive coordinator for the Buffalo Bills, New York Jets, Minnesota Vikings and, most recently, the San Diego Chargers in the National Football League.
Cottrell began his coaching career at Rutgers University, where he coached for eight years. In 1981, he got his first NFL job when Marv Levy hired him as linebackers coach for the Kansas City Chiefs.
Considered an innovator in the 3-4 defense, Cottrell was an assistant coach for the Buffalo Bills from 1995-00, the last three seasons as defensive coordinator. From 1998 through 2000, the Bills finished no worse than sixth in the league in total defense. In 1999, the Bills led the league in total defense.