Pittsburgh defeated Dallas 21-17 in Super Bowl X in Miami. The Steelers joined Green Bay and Miami as the only teams to win two Super Bowls; the Cowboys became the first wild-card team to play in the Super Bowl. The CBS telecast was viewed by an estimated 80 million people, the largest television audience in history.
Lloyd Nordstrom, the president of the Seahawks, died at 66, January 20. His brother Elmer succeeded him as majority representative of the team.
The owners awarded Super Bowl XII, to be played on January 15, 1978, to New Orleans. They also adopted the use of two 30-second clocks for all games, visible to both players and fans to note the official time between the ready-for-play signal and snap of the ball, March 16.
A veteran player allocation was held to stock the Seattle and Tampa Bay franchises with 39 players each, March 30-31. In the college draft, Seattle and Tampa Bay each received eight extra choices, April 8-9.
The Giants moved into new Giants Stadium in East Rutherford, New Jersey.
The Steelers defeated the College All-Stars in a storm-shortened Chicago College All-Star Game, the last of the series, July 23. St. Louis defeated San Diego 20-10 in a preseason game before 38,000 in Korakuen Stadium, Tokyo, in the first NFL game outside of North America, August 16.