Super Bowl XII was an American football game between the National Football Conference (NFC) champion Dallas Cowboys and the American Football Conference (AFC) champion Denver Broncos to decide the National Football League (NFL) champion for the 1977 season. The Cowboys defeated the Broncos 27–10 to win their second Super Bowl. The game was played on January 15, 1978, at the Louisiana Superdome in New Orleans. This was the first Super Bowl in a domed stadium, and the first time that the game was played in prime time in the Eastern United States.

The game pitted Cowboys quarterback Roger Staubach against their former quarterback, Craig Morton. Led by Staubach and the Doomsday Defense, Dallas advanced to its fourth Super Bowl after posting a 12–2 record in the regular season and home playoff victories over the Chicago Bears and Minnesota Vikings. The Broncos, led by Morton and the Orange Crush Defense, made their first-ever postseason appearance after a franchise-best 12–2 regular season record. Also with home-field advantage, Denver posted playoff wins over the Pittsburgh Steelers and Oakland Raiders.

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