The 1966 NFL season was the 47th regular season of the National Football League, and the season after which was played Super Bowl I, though it was called the AFL-NFL World Championship Game. The league expanded to 15 teams with the addition of the Atlanta Falcons, thus an odd number of teams (making byes necessary). This was the last season that the NFL had just two divisions, in which setup the conference champions went directly to the NFL Championship Game.