As of Super Bowl XLII, that would be the San Francisco 49ers who have a Super Bowl record of 5-0 and is the only team that has played more than one Super Bowl that has an undefeated record. The Baltimore Ravens, New York Jets, and Tampa Bay Buccaneers are each 1-0.
While the 49ers have gone undefeated in their superbowl appearances, the Pittsburgh Steelers have played in 7 Super Bowl games and won 6...so who has the best record after all?
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The Pittsburgh Steelers, with victories in Super Bowls 9, 10, 13, 14, 40, and 43. As of 2009, the San Francisco 49'ers and Dallas Cowboys have 5 each.
Pittsburgh Steelers, with six Super Bowl victories (games played in 1975, 1976, 1979, 1980, 2006, and 2009).
The 2007 Patriots went undefeated for the entire season until they lost the Super Bowl to the Giants. Unless you meant to ask what team has the best win-loss record in the history of the franchise, but has never won a Super Bowl, that would be your answer.
San Francisco 49ers
Only the 1972 Miami Dolphins have won a Super Bowl with an undefeated record.
Bruce Smith scored one for the Bills in Super Bowl XXV. The Cardinals were awarded a safety in Super Bowl XLIII, but that was as a result of a holding call in the end zone.
Dallas Cowboys hold the record for the most fumbles in one super bowl. The Dallas Cowboys played the Buffalo Bills for this game.