The Bills have lost 4 Super Bowls but to only 3 different teams:
The Bills lost Super Bowl 25 to the New York Giants.
The Bills lost Super Bowl 26 to the Washington Redskins.
The Bills lost Super Bowl 27 to the Dallas Cowboys .
The Bills lost Super Bowl 28 to the Dallas Cowboys.
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The Bills have lost 4 Super Bowls but to only 3 different teams:
S.B. 25 to the NY Giants
S.B. 26 to the Redskins
S.B. 27 to the Cowboys
S.B. 28 to the Cowboys
http://www.nfl.com/superbowl/history
The Dallas Cowboys defeated four teams in their five Super Bowl victories -- the Miami Dolphins in Super Bowl VI, the Denver Broncos in Super Bowl XII, the Buffalo Bills in Super Bowls XXVII and XXVIII and the Pittsburgh Steelers in Super Bowl XXX.