Derek Anthony Barnett (born June 25, 1996) is an American football defensive end for the Philadelphia Eagles of the National Football League (NFL). He played college football at the University of Tennessee, and was drafted by the Eagles with the 14th overall pick in the 2017 NFL Draft.
Barnett attended Brentwood Academy in Brentwood, Tennessee. As a senior, he had 60 tackles (18 for loss) and 5.5 sacks. He was rated by the Rivals.com recruiting network as a four-star recruit. In 2013, he committed to the University of Tennessee to play college football under head coach Butch Jones.
Barnett became the first true freshman defensive lineman to start the season opener in Tennessee history. In the season opener against Utah State at Neyland Stadium, Barnett had three total tackles in the home victory. In the following week against Arkansas State, he had his first career collegiate sack in the home victory. In Barnett's first game against a conference opponent, he totaled eight tackles against Georgia in a loss at Sanford Stadium in the annual rivalry game. Against the Chattanooga Mocs, he had his first career collegiate fumble recovery in the home victory. Against Ole Miss, he had his first multi-sack game of his collegiate career with 2.0 in the road loss at Vaught–Hemingway Stadium. In addition, he recorded ten total tackles. On November 1, against South Carolina, Barnett had a season-high three sacks to go along with five total tackles in the overtime win at Williams-Brice Stadium. Barnett would be an instrumental asset for the Volunteers in making a bowl game for the first time since the 2010 season. In the 2015 TaxSlayer Bowl against Iowa, Barnett had three total tackles in the 45–28 victory at EverBank Field in Jacksonville, Florida.