Through Super Bowl XLII, that would be the Buffalo Bills and the Minnesota Vikings who have both played in four Super Bowls without a victory.
The Green Bay packers played in 4 Super Bowls winning 3.
The Dallas Cowboys played in eight Super Bowls, winning five.
The Oakland Raiders have played in five Super Bowls, winning three and losing the other two.
Because that's the number of Super Bowls the Redskins have won. They have played in 5 Super Bowls, winning XVII, XXII, and XXVI and losing VII and XVIII.
buffalo went 4 times in a row with out winning
They have played in 6 Super Bowls, winning 2 of them.
Joe Montana has played in and won 4 Super Bowls winning the MVP award for the game 3 times.
Troy Polamalu played in three Super Bowls, winning two (XL, XLIII) and losing one (XLV).
Vikings and Bills
Joe Montana has played in and won 4 Super Bowls winning the MVP award for the game 3 times.
Through Super Bowl XLIV, both the Minnesota Vikings (SBs IV, VIII, IX, and XI) and the Buffalo Bills (SBs XXV, XXVI, XXVII, and XXVIII) have lost four Super Bowls without winning one.