2015 Denver Broncos season

The 2015 Denver Broncos season was the franchise's 46th season in the National Football League (NFL) and the 56th overall. It was also the fourth season with Peyton Manning as the team's starting quarterback, as well as the final season of Manning's 18-year NFL career. After losing in the divisional round of the playoffs during three of the previous four seasons, the Broncos underwent numerous coaching changes, including a mutual parting with head coach John Fox, and the hiring of Gary Kubiak as the new head coach. Under Kubiak and offensive coordinator Rick Dennison, the Broncos planned to install a run-oriented West coast offense with zone blocking to blend in with Manning's shotgun passing style, but struggled with numerous changes and injuries to the offensive line. Manning missed six games due to a partial tear of the plantar fascia in his left foot and had his worst statistical season since his rookie year with the Indianapolis Colts in . Backup quarterback Brock Osweiler filled in for Manning during the second half of the regular season, before Manning re-claimed the starting quarterback position prior to the team's postseason run. Under defensive coordinator Wade Phillips, the Broncos' defense ranked No. 1 in total yards, passing yards, average yards per rush and sacks, and like the previous three seasons, the team continued to set numerous individual, league and franchise records. The team's defense is widely considered to be among the greatest of all time, particularly due to the fact that it was pressured to aid a lackluster offense for most of the season. The team's defensive backfield, arguably the most dominant part of the defense, gave itself the nickname "No Fly Zone". The Broncos clinched their fifth-consecutive AFC West division title, fourth consecutive first-round bye and the AFC's No. 1 playoff seed for the third time in four seasons. As was the case during the regular season, the Broncos' defense dominated their playoff opponents. During the Broncos' three playoff games, they recorded 14 sacks, forced seven turnovers, surrendered only one touchdown pass and gave up just 44 combined points (an average of just 14.7 points a game). The Broncos defeated the Pittsburgh Steelers 23–16 in the divisional round and the defending Super Bowl champion New England Patriots 20–18 in the AFC Championship game.