The 2002–03 OPJHL season is the tenth season of the Ontario Provincial Junior A Hockey League (OPJHL). The thirty-five teams of the North, South, East, and West divisions competed in a 49-game schedule. Come February, the top eight teams of each division competed for the Frank L. Buckland Trophy, the OPJHL championship. The winner of the Buckland Cup, the Wellington Dukes, went on to win the Dudley Hewitt Cup as Central Canadian Champions. The Dukes were not successful in winning the 2003 Royal Bank Cup.