Yes ... not only are the Bills the only team to lose four consecutive Super Bowls they are the only team to ever play in four consecutive Super Bowls.
Marv Levy of the Buffalo Bills (Super Bowls XXV,XXVI, XXVII, and XXVIII).
Marv Levy of the Buffalo Bills
The Minnesota VikingsThe Vikes lost Super Bowls IV, VIII, and IX. They also lost Super Bowl XI to become the first team to lose 4 Super Bowls.
The Minnesota Vikings (lost Super Bowls IV, VIII, and IX).
Gale Gilbert, backup QB for the Buffalo Bills in Super Bowls XXV-XXVIII and backup QB for the San Diego Chargers in Super Bowl XXIX.
Bud Grant of the Minnesota Vikings (Super Bowls IV, VIII, IX, an XI).
Bud Grant of the Minnesota Vikings (Super Bowls IV, VIII, IX, and XI).
The buffalo Bills
One Super Bowl
The Washington Redskins lost 2 Super Bowls XII and XVIII.