Zero.
That is the number of teams that have ever won three consecutive Super Bowls in NFL history. Eight teams have tried to three-peat after winning back-to-back Super Bowls, and so far, they’re 0-8 in those attempts.
Why is that?
More than any other American professional league, winning in the NFL is the most difficult. Every part of your organization changes when you win a Super Bowl, let alone multiple. Your front office and coaching staff get poached, Your schemes get more solvable over time, and, when you lose a chunk of your coaching staff, it can be difficult to find answers all the time with new coaches who aren’t as familiar with your system.