The San Francisco 49ers are 5-0 in Super Bowls. The New York Jets, Baltimore Ravens, Tampa Bay Buccaneers and New Orleans Saints are all 1-0.
As of the 2012 season, there are five teams that have played in the Super Bowl and have not lost. Four of those teams (Jets, Ravens, Buccaneers, and Saints) have played in only one Super Bowl and have been victorious. The San Francisco 49ers have played in and won five Super Bowls games. Super Bowl 47 will determine either the 49ers remaining as the only undefeated Super Bowl team with multiple appearances, or the Ravens will take that distinguished honor if they win.
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After the 1932 season, there have been four undefeated/untied teams in the regular season in NFL history:
1. 1934 Chicago Bears: 13-0
2. 1942 Chicago Bears: 11-0
3. 1972 Miami Dolphins: 14-0 (Modern Perfect Season)
4. 2007 New England Patriots: 16-0(Games below are pre-playoffs {These games were prior to the 1932 season})
5. 1920 Akron Pros 8-0-3
6. 1922 Canton Bulldogs 10-0-2
7. 1923 Canton Bulldogs 11-0-1
8. 1929 Greenbay Packers 12-0-1
Of these four teams only the 1972 Miami Dolphins won an NFL Championship/Super Bowl and finished the entire season undefeated (17-0 including playoffs). The other three teams lost the NFL Championship/Super Bowl game.
Before the merger with the NFL, the 1948 Cleveland Browns had the only undefeated season in All-America Football Conference history, finishing the regular season 14-0 and going on to win the AAFC championship game.
Canton Bulldogs were the first NFL Champs as well as the first repeat champs winning the 1922, 1923 seasons.
The 1972 Miami Dolphins went 14-0 (then there were only 14 regular season games). They then won two play off games and Superbowl VII with a final record of 17-0. The 2007 Patriots went undefeated in regular season but lost Superbowl 42 with a final record of 18-1.
No AFL team ever went undefeated. The 1972 Miami Dolphins are the only NFL team to have ever gone undefeated.
1972 Miami Dolphins (17-game regular season) and the 2007 New England Patriots (16-game regular season).
Chicago Bears in 1934 and 1942 before the AFL-NFL merger.
1972 Dolphins had (and still have) the perfect record, having won all of their pre-season and regular season games as well as winning the Super Bowl.
There are no more undefeated teams left in the National Football League during the 2010-2011 season
Colts and Saints.
Not to my information
The MLB team that has gone undefeated in the playoffs were the 1976 Cincinatti Reds swept the Phillies 3-0 in the NLCS and then swept the Yankees 4-0.
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