The 1983–84 QMJHL season was the 15th season in the history of the Quebec Major Junior Hockey League. Eleven teams played 70 games each in the regular season.
Mario Lemieux of the Laval Voisins scores 133 goals, and has 149 assists, setting the all-time Canadian Hockey League record of 282 points, and 133 goals in a regular season. His total of 149 assists ranks second only to Pierre Larouche's total of 157 from the 1973–74 QMJHL season. Lemieux also won four QMHL trophies at the season's end, as well as the CHL Player of the Year award.
The Laval Voisins repeated as first overall in the regular season, winning the Jean Rougeau Trophy, and won their first President's Cup, defeating the Longueuil Chevaliers in the finals.
Note: GP = Games played; W = Wins; L = Losses; T = Ties; Pts = Points; GF = Goals for; GA = Goals against
Note: GP = Games played; G = Goals; A = Assists; Pts = Points; PIM = Penalties in Minutes
Mario Lemieux was the leading scorer of the playoffs with 52 points (29 goals, 23 assists).
- Laval Voisins defeated Granby Bisons 4 games to 0.
- Verdun Juniors defeated Saint-Jean Castors 4 games to 0.
- Drummondville Voltigeurs defeated Shawinigan Cataractes 4 games to 2.
- Longueuil Chevaliers defeated Quebec Remparts 4 games to 1.
- Laval Voisins defeated Drummondville Voltigeurs 4 games to 0.
- Longueuil Chevaliers defeated Verdun Juniors 4 games to 2.
- Laval Voisins defeated Longueuil Chevaliers 4 games to 2.
- First team
- Second team
List of First/Second/Rookie team all-stars
Trophies and awards
- Michel Brière Memorial Trophy - Most Valuable Player, Mario Lemieux, Laval Voisins
- Jean Béliveau Trophy - Top Scorer, Mario Lemieux, Laval Voisins
- Guy Lafleur Trophy - Playoff MVP, Mario Lemieux, Laval Voisins
- Jacques Plante Memorial Trophy - Best GAA, Tony Haladuick, Laval Voisins
- Emile Bouchard Trophy - Defenceman of the Year, Billy Campbell, Verdun Juniors
- Mike Bossy Trophy - Best Pro Prospect, Mario Lemieux, Laval Voisins
- Michel Bergeron Trophy - Offensive Rookie of the Year, Stephane Richer, Granby Bisons
- Raymond Lagacé Trophy - Defensive Rookie of the Year, James Gasseau, Drummondville Voltigeurs
- Frank J. Selke Memorial Trophy - Most sportsmanlike player, Jerome Carrier, Verdun Juniors
- Marcel Robert Trophy - Best Scholastic Player, Gilbert Paiement, Chicoutimi Saguenéens
- ^ 2007–08 Canadian Hockey League Information / Accommodations Guide and Record Book (pages 112–113)