The 2015 UCF Knights football team represented the University of Central Florida in the 2015 NCAA Division I FBS football season. The Knights were members of the East Division of the American Athletic Conference, defending conference co-champions, and played their home games at Bright House Networks Stadium on UCF's main campus in Orlando, Florida. The Knights were led by head coach George O'Leary, who was in his 12th and final season with the team. After starting the season 0–6, O'Leary resigned as UCF's interim athletic director, a position he had held since June when Todd Stansbury left for the same position at Oregon State. Following UCF's 59–10 defeat by Houston on homecoming, dropping the Knights to an 0–8 record, O'Leary resigned as head football coach. Quarterbacks coach Danny Barrett served as interim head coach for the remainder of the season.

George Joseph O'Leary is a former American football coach and college athletics administrator. He served as the head football coach of the Georgia Tech Yellow Jackets from 1994 to 2001 and the UCF Knights from 2004 to 2015. He was famously hired in 2001 to be the head coach of the Notre Dame Fighting Irish but resigned after five days for lying on his resume. O'Leary was an assistant coach for the Minnesota Vikings of the National Football League (NFL) from 2002 to 2004, and an assistant coach for the Syracuse Orange and San Diego Chargers.