The 2005 Pittsburgh Steelers season was the franchise's 73rd season as a professional sports franchise and as a member of the National Football League (NFL). It was the 6th season under the leadership of general manager Kevin Colbert and the 14th under head coach Bill Cowher. The Steelers failed to improve upon their 15–1 record from 2004 and in 2005, the Steelers struggled. At one point, they were 7–5 and in danger of missing the playoffs but rose to defeat the Chicago Bears on December 11 and started a four-game win streak to finish the season at 11–5.

The Pittsburgh Steelers are a professional American football team based in Pittsburgh. The Steelers compete in the National Football League (NFL) as a member club of the American Football Conference (AFC) North Division. Founded in 1933, the Steelers are the seventh-oldest franchise in the NFL, and the oldest franchise in the AFC.