Have there been any back-to-back Super Bowl winners?

There have been eight instances in which a team won back-to-back Super Bowls as of 2015. The Green Bay Packers were the first team to do so when they won Super Bowls I and II.

The Miami Dolphins won Super Bowls VII and VIII. The Pittsburgh Steelers immediately followed as back-to back-winners when they won Super Bowls IX and X. Pittsburgh accomplished the feat again in Super Bowls XIII and XIV. The San Francisco 49ers won Super Bowls XXIII and XXIV. The Dallas Cowboys won Super Bowls XXVII and XXVIII. The Denver Broncos won Super Bowls XXXII and XXXIII. The New England Patriots won Super Bowls XXXVIII and XXXIX.