Myles David Jack (born September 3, 1995) is an American football linebacker for the Jacksonville Jaguars of the National Football League (NFL). He played college football for the UCLA Bruins and was named the top freshman player in the Pac-12, receiving honors both on defense as well as on offense for his work as a running back and was named an All-Pac-12 linebacker twice. In 2015, Jack dropped out of UCLA and declared for the draft after suffering a season-ending knee injury. Jack was selected by the Jacksonville Jaguars in the second round of the 2016 NFL Draft.
Jack was born in Scottsdale, Arizona, to La Sonjia and H. David Jack. While in high school, he lettered in football and track at Bellevue High in Bellevue, Washington. In football, Jack played exclusively as a running back through his sophomore year, before also becoming a linebacker. As a senior, he had 98 tackles and 24 sacks, leading his team to a 14–0 record.