On March 24, 1936, the Detroit Red Wings played an NHL Stanley Cup play-off game against the Montreal Maroons that combined 60 minutes of regulation play and 116 minutes, 30 seconds of overtime. Detroit won 1-0 and went on to win the series and their first Stanley Cup. The game did not end until 2:30 a.m. the following morning, March 25.
Source : Michigan is Amazing and Detroit Every Day.
List of Stanley Cup Champions provided by Wikipedia.