Super Bowl XL was an American football game between the National Football Conference (NFC) champion Seattle Seahawks and the American Football Conference (AFC) champion Pittsburgh Steelers to decide the National Football League (NFL) champion for the 2005 season. The Steelers defeated the Seahawks by the score of 21–10. The game was played on February 5, 2006, at Ford Field in Detroit, Michigan. It is the most recent Super Bowl broadcast on ABC who lost the rights to broadcast Super Bowl games in the next NFL TV contract and the first where all aspects of the game itself were aired in HD. This was the last of 10 straight Super Bowls to feature a team seeking its first win.

The 2005 Seattle Seahawks season was the franchise's 30th season in the National Football League (NFL), their fourth playing their home games at Qwest Field and their seventh season under head coach Mike Holmgren. They won the National Football Conference (NFC) Championship Game and played in Super Bowl XL, which they lost 21–10 to the Pittsburgh Steelers. The Seahawks compiled a 13–3 record in the regular season, easily winning the NFC West and earning the NFC top seed, thus clinching home field advantage in the NFC playoffs for the first time in franchise history. There, they beat the Washington Redskins and Carolina Panthers to win the George Halas Trophy, and advance to their first ever Super Bowl. Combining the regular season and postseason, the Seahawks finished with a perfect 10–0 record at Qwest Field. The 2005 team was widely considered the best team in club history until the Super Bowl XLVIII championship. The 2005 season was also the team's 30th anniversary season in the NFL. The Seahawks were the only NFC team from the 2004 playoffs to qualify for the 2005 playoffs.