Miami Dolphins and New England Patriots are the only Nfl teams to go undefeated in the regular season, but the Dolphins are the only team to go undefeated and also win the Superbowl.
Dolphins and patriots
the MIAMI DOLPHINS went undefeated in the year 1972
the green bay packers
The Miami Dolphins went undefeated in 1972 during the 3rd year of being coached by Don Shula.
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.
No AFL team ever went undefeated. The 1972 Miami Dolphins are the only NFL team to have ever gone undefeated.