The 1977–78 QMJHL season was the ninth season in the history of the Quebec Major Junior Hockey League. The league inaugurates two awards, the Robert Lebel Trophy for the team with best goals against average, and the Guy Lafleur Trophy for the Most Valuable Player of the playoffs. Ten teams played 72 games each in the schedule. The Trois-Rivières Draveurs finished first overall in the regular season winning the Jean Rougeau Trophy, and won the President's Cup defeating the Montreal Juniors in the finals.

Team changes

Final standings

Note: GP = Games played; W = Wins; L = Losses; T = Ties; PTS = Points; GF = Goals for; GA = Goals against

Scoring leaders

Note: GP = Games played; G = Goals; A = Assists; Pts = Points; PIM = Penalties in minutes

Playoffs

Richard David was the leading scorer of the playoffs with 33 points (17 goals, 16 assists).

All-star teams

Trophies and awards