The 2015 season was the Cleveland Browns' 63rd in the National Football League, their 67th overall, and the second and final season under the head coach/general manager tandem of Mike Pettine and Ray Farmer. Both Pettine and Farmer were fired on January 3, 2016, after the team failed to improve on their 7–9 record from the previous season, going 3–13 season, tied with the Tennessee Titans for the worst record in the league. The Browns introduced new uniforms prior to the start of the season, updating the orange color to a darker hue, among other changes.

The 2015 NFL season was the 96th season in the history of the National Football League (NFL), and the 50th in the Super Bowl era. To celebrate the 50th season of the Super Bowl, a gold-plated NFL logo and other various gold-themed promotions were used throughout the season. It began on Thursday, September 10, 2015, with the annual kickoff game featuring the defending Super Bowl XLIX champion New England Patriots defeating the Pittsburgh Steelers. The season concluded with Super Bowl 50, the league's championship game, on Sunday, February 7, 2016, at Levi's Stadium in Santa Clara, California, with the Denver Broncos defeating the Carolina Panthers.