I'm sure there are several tied with this game, but in 1992, the Pittsburgh Penguins overcame a 4-1 defecit in Game 1 of the Stanley Cup Final to beat the Chicago Blackhawks 5-4.
Pittsburgh went on to sweep the series 4-0.
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It just happened. The Boston Bruins, down 4-1 with about 14 minutes left in the third period, came back with three goals to tie the game against the Toronto Maple Leafs, and won it \in overtime.
Ironically the Bruins went from a 3-0 lead in Game 7 vs. the Philadelphia Flyers in 2010 before losing it, but the Flyers' comeback started earlier in the game.