Chicago bears From 1933, when the first NFL championship game was played, to 2008, when Super Bowl XLII was played, the team that has lost the most NFL championship games is the New York Giants who have lost 11 NFL championship games (pre Super Bowl) and 1 Super Bowl for a total of 12.
The Pittsburgh Steelers have played in 15 championship games. The most in NFL history.
The Pittsburgh Steelers have played in 15 AFC championship games. That is the most in NFL history.
Now in 2012, The Colombus Blue Jackets has lost most of their games.
The Minneapolis/Los Angeles Lakers have lost in the championship finals 15 times.
The Philadelphia Phillies