The National Hockey League (NHL) Conference Finals are the Eastern Conference and Western Conference championship series of the NHL. The Conference Finals are best-of-seven series, and comprises the third round of the Stanley Cup playoffs. The two series are played in late May (early June in 1995 and 2013, due to labour disputes that delayed the start of the season). The winners of the Eastern and Western Conference Finals receive the Prince of Wales Trophy and Clarence S. Campbell Bowl, respectively, and advance to face each other in the final round.
Before the 1967–68 season, the NHL was made up only of a single division. From the 1967–68 season through the 1973–74 season, the NHL was made up of two divisions (as opposed to conferences), the East Division and the West Division.
Following the 1973–74 season, the NHL again realigned. The East and West Divisions were renamed the Prince of Wales and Clarence Campbell Conferences, respectively. At the time, the new conferences and divisions had little to do with North American geography and geographical references were removed.
Beginning in the 1981–82 season, the conferences and the playoffs were realigned. The NHL was hoping to reduce travel costs in the face of a struggling economy and high energy prices. The regular season and playoffs were also altered to emphasize divisional match-ups.