Ken Donahue (February 28, 1925 – March 21, 2001) was an American football player and coach.
Donahue and four other men, Pat Dye, Bill Oliver, and Paul Bryant, created the multiple defense scheme that allowed the players to switch defenses quickly.
The 4-3 and 5-2 schemes are still used by NCAA and NFL teams today.
Following his tenure at Alabama, Donahue was hired as the defensive coordinator for Tennessee.
He is best remembered for the 1985 season, when his defense held the Vols' final seven opponents to just four touchdowns, and provided a major catalyst for the team's 35–7 upset of Miami in the Sugar Bowl.