The 1972–73 QMJHL season was the fourth season in the history of the Quebec Major Junior Hockey League. The summer of 1972 saw the departure of the Saint-Jérôme Alouettes and the Verdun Maple Leafs from the league, reducing the circuit to eight teams. In an off-season lawsuit between the QMJHL and the OHA, the QMJHL gained a team, when the Montreal Junior Canadiens transferred leagues.