The 1997–98 OPJHL season is the fifth season of the Ontario Provincial Junior A Hockey League (OPJHL). The twenty-two teams of the MacKenzie, MacKinnon, Phillips, and Ruddock Divisions competed in a 51-game schedule. The top 4 teams of each division make the playoffs. The winner of the OPJHL playoffs, the Milton Merchants, won the 1998 Buckland Cup as OHA Champions and the Dudley Hewitt Cup as Central Canadian Champions, but failed to win the 1998 Royal Bank Cup.