lots have but,The Pittsburgh Steelers won their sixth title in a 27-23 victory against the Arizona Cardinals for Superbowl 2009.
The Miami Dolphins in 1972. Although they were considered to have had a perfect season, they did lose three preseason games.
The new Orleans saints!!!!!!!!!!!!!
UCLA
The Miami Dolphins. ANSWER: The Cleveland Browns went 14-0 in 1948 and won the All-America Football Conference championship. They would go on to join the NFL two years later. The Dolphins were the first NFL team to go undefeated in 1972. There are college teams, of course, that go undefeated almost every season.
The last men's team to go undefeated during the regular season and win the tournament was Indiana in 1976.
The last women's team to go undefeated and go on to win the national championship was the 2001-2002 Connecticut Huskies that went 39-0. Tennessee Volunteers were undefeated in 1998 and wre also 39-0.
Miami heat sweept the first two
norh Carolina state
The 1972 Miami Dolphins.The only team in the NFL to go undefeated through an entire season 17 - 0 ( including playoffs ).
Chicago bulls
The 1972 Miami Dolphins went 14-0 in the regular season, and then went on to win the Super Bowl The above answer is incorrect. The correct answer is the 1920 Akron Pros, who went 8-0-3 and were crowned as the NFL's first champions. The '72 Dolphins were the first team to have a *perfect* season, but not the first to go undefeated.
The 1972 Miami dolphins team is still the only team to go undefeated and win the super bowl what a team.. the patriots almost did they went undefeated but lost to the giants in the super bowl
UNLV 1991