List of last undefeated NFL teams by season

This is a season-by-season breakdown of the last undefeated National Football League (NFL) team. This list indicates the teams who won the most games in a season before suffering their first loss. Only one team in NFL history has recorded a perfect season: the 1972 Miami Dolphins, who recorded a 14–0 regular season before winning all three of their playoff games, including Super Bowl VII, to finish with a 17–0 record. In addition, before the institution of a championship game, four NFL champions finished the season undefeated: the 1920 Akron Pros, the 1922 and 1923 Canton Bulldogs, and 1929 Green Bay Packers. Since 1972, an urban legend has formed stating that the surviving members of the Dolphins team will open bottles of champagne after the last undefeated team loses; in reality, some members that live close to each other may share a non-alcoholic toast. The last team in a new season to lose a game has won the Super Bowl twelve times. Before the Super Bowl era, the last undefeated team won fourteen Championship games, four of which were in the AFL. Before playoffs began in the 1933 season, the last undefeated team earned the NFL championship seven times by having the highest winning percentage (ties were not included in calculation). The last team with an unblemished record has made 29 Super Bowl and 26 Championship game appearances. The Chicago Bears have been the last team undefeated 17 times (the last time was during the 2010 season), and won the Championship 5 times in those years. The next team, the Los Angeles Rams, have been the last undefeated team 12 times as of the 2018 season. The Rams won 2 titles when they were the last unbeaten team. The New York Giants hold the mark for beating the last undefeated team the most times. They have accomplished this 11 times; the last time it happened was in 2010.