Super Bowl X was an American football game between the National Football Conference (NFC) champion Dallas Cowboys and the American Football Conference (AFC) champion Pittsburgh Steelers to decide the National Football League (NFL) champion for the 1975 season. The Steelers defeated the Cowboys 21–17 to become the third franchise to win consecutive Super Bowls, joining the Miami Dolphins and Green Bay Packers. It was also the first Super Bowl in which both teams had previous Super Bowl titles, as the Steelers were the defending champions and the Cowboys had won four years earlier.