The 1998–99 OPJHL season is the sixth season of the Ontario Provincial Junior A Hockey League (OPJHL). The thirty-seven teams of the Central, East, and West divisions competed in a 51-game schedule. The top eight of each division made the Buckland Cup playoffs. The winner of the Buckland Cup, the Bramalea Blues, won the 1999 Dudley Hewitt Cup as Central Canadian Champions, but failed to win the 1999 Royal Bank Cup.