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Has an NFL team ever gone undefeated?

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The Editors of Encyclopaedia Britannica

The Miami Dolphins are the only team in NFL history to have a perfect season, posting a record of 17–0 in the 1972 season. The Dolphins, under coach Don Shula, went 14–0 in the regular season and then won their three playoff games, including Super Bowl VII, which was played at the Los Angeles Memorial Coliseum against the Washington Redskins (now Commanders) and decided by a score of 14–7. Key players for the Dolphins included quarterback Bob Griese, wide receiver Paul Warfield, running back Larry Csonka, and linemen Larry Little and Jim Langer, along with the “no-name” defense led by Nick Buoniconti.