The 1977 NFL season was the 58th regular season of the National Football League. The two second-year expansion teams switched conferences, with the Seattle Seahawks moving from the NFC West to the AFC West, and the Tampa Bay Buccaneers transferring from the AFC West to the NFC Central.

The 1977 Dallas Cowboys season was their 18th in the National Football League (NFL). The club appeared twice on Monday Night Football. Rookie running back Tony Dorsett rushed for 1,007 yards and became the second member of the Cowboys to have a 1,000-yard rushing season. Dallas scored 345 points, which ranked first in the NFC, while its defense only gave up 212 points. Dallas finished with a 12–2 record. The Cowboys made it to their fourth Super Bowl and beat the Denver Broncos to capture their second Super Bowl title. They were the first team from the NFC East Division to win two Super Bowls. Their 15–2 (.882) record remains the highest single-season winning percentage in franchise history.