(A1) Montreal Canadiens vs. (A2) Quebec Nordiques
The Quebec Nordiques and Montreal Canadiens battled in a seven-game series. Bitter rivals from the province of Quebec, the Nords shocked the Habs in 1982, only to see a fourth-place Montreal club upset Quebec two years later. In the deciding seventh game at the Montreal Forum, Peter Stastny scored the game and series winning goal, giving Quebec an improbable 3–2 overtime win and berth in the Wales Conference Finals. Quebec would not get to the conference finals again until 1996, their first year as Colorado Avalanche. They would win the Stanley Cup.
(P1) Philadelphia Flyers vs. (P3) New York Islanders
The Philadelphia Flyers ended the New York Islanders' string of five straight seasons in the Stanley Cup Final by dispatching the club four games to one. Flyers goaltender Pelle Lindbergh registered a pair of shutouts, one in the first game and the other in the clinching fifth game, by a 1–0 score.
(P1) Philadelphia Flyers vs. (A2) Quebec Nordiques
Although the Flyers held the best record in the NHL with 53 wins and 113 points, the Adams Division held a better record against the Patrick Division, so the Wales finals began in Quebec City. Philadelphia and Quebec split the first four games of the series, then the Flyers edged the Nordiques, 2–1 in game five. Game six in Philadelphia was a tour-de-force for the Flyers, outshooting Quebec 36–15, and winning 3–0. Flyers captain Dave Poulin's shorthanded goal early in the second period was the deciding factor in the contest. The team returned to the Stanley Cup Finals for the first time since 1980. The win came at a high cost for the Flyers as both 54-goal forward Tim Kerr and defenceman Brad McCrimmon would be lost for the remainder of the playoffs with injuries.
(S1) Edmonton Oilers vs. (N2) Chicago Black Hawks
The Oilers defeated the Black Hawks in a six-game series which broke all sorts of records for total offense. Edmonton won the first two games at home by 11–2 and 7–3 scores, only to see Chicago strike back at home with 5–2 and 8–6 victories. However, Edmonton rebounded to blast the Hawks in the final two games, 10–5 and 8–2 to earn their third trip to the Cup Finals in as many years. Edmonton set all-time playoff marks with most goals in one series, most goals in a six-game series, and both clubs set records with most total goals in a semifinal series and most total goals in one six-game series. Oilers' Jari Kurri scored three hat tricks in the series, setting a still-standing NHL record.
Edmonton would lose the first game to the Flyers but would then take the next four to win their second straight Stanley Cup. Wayne Gretzky was awarded the Conn Smythe Trophy as the playoffs' most valuable player.