17-0 Miami Dolphins
18-0 Patriots
No NFL teams went undefeated in 2009.
im not sure of all them but i know that the Miami Dolphins have gone undefeated, and the New England Patriots have gone undefeated.
Colts and Saints.
Colts and Saints.
1972 Miami Dolphins, that is it
the MIAMI DOLPHINS went undefeated in the year 1972
There are no more undefeated teams left in the National Football League during the 2010-2011 season
2009
Dolphins back in the day. 71 I believe
AnswerColts, Broncos and Saints as of 10-26-09.
2007 Patriots 1972 Dolphins
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.