The 2003–04 OPJHL season is the 11th 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 Aurora Tigers, went on to win both the Dudley Hewitt Cup as Central Canadian Champions and the 2004 Royal Bank Cup as National Champions.^[1]

• Huntsville Wildcats fold mid-season.
• Peterborough Bees change name to Peterborough Stars.
• Milton Merchants change name to Milton Icehawks.
• Hamilton Kiltys change name to Hamilton Red Wings

Note: GP = Games played; W = Wins; L = Losses; OTL = Overtime losses; SL = Shootout losses; GF = Goals for; GA = Goals against; PTS = Points; x = clinched playoff berth; y = clinched division title; z = clinched conference title

Divisional Quarter-final

Wellington Dukes defeated Peterborough Stars 4-games-to-1

Bowmanville Eagles defeated Syracuse Jr. Crunch 4-games-to-none

Cobourg Cougars defeated Bancroft Hawks 4-games-to-3

Kingston Voyageurs defeated Trenton Sting 4-games-to-1

Aurora Tigers defeated Lindsay Muskies 4-games-to-none

Newmarket Hurricanes defeated Pickering Panthers 4-games-to-none

Stouffville Spirit defeated Thornhill Rattlers 4-games-to-2

Collingwood Blues defeated Oshawa Legionaires 4-games-to-none

Georgetown Raiders defeated Bramalea Blues 4-games-to-none

Hamilton Red Wings defeated Streetsville Derbys 4-games-to-none

Oakville Blades defeated Burlington Cougars 4-games-to-none

Milton Icehawks defeated Mississauga Chargers 4-games-to-1

St. Michael's Buzzers defeated Buffalo Lightning 4-games-to-none

Wexford Raiders defeated Ajax Axemen 4-games-to-none

North York Rangers defeated Vaughan Vipers 4-games-to-none

Markham Waxers defeated Couchiching Terriers 4-games-to-none

Divisional Semi-final

Wellington Dukes defeated Kingston Voyageurs 4-games-to-3

Bowmanville Eagles defeated Cobourg Cougars 4-games-to-none

Aurora Tigers defeated Collingwood Blues 4-games-to-none

Newmarket Hurricanes defeated Stouffville Spirit 4-games-to-1

Georgetown Raiders defeated Milton Icehawks 4-games-to-none

Oakville Blades defeated Hamilton Red Wings 4-games to-2

St. Michael's Buzzers defeated Markham Waxers 4-games-to-none

North York Rangers defeated Wexford Raiders 4-games-to-2

Divisional Final

Bowmanville Eagles defeated Wellington Dukes 4-games-to-3

Aurora Tigers defeated Newmarket Hurricanes 4-games-to-none

Oakville Blades defeated Georgetown Raiders 4-games-to-1

St. Michael's Buzzers defeated North York Rangers 4-games-to-1

Semi-final

St. Michael's Buzzers defeated Bowmanville Eagles 4-games-to-2

Aurora Tigers defeated Oakville Blades 4-games-to-2

Final

Aurora Tigers defeated St. Michael's Buzzers 4-games-to-2

Hosted by North Bay Skyhawks in North Bay, Ontario. Aurora Tigers won the event.

Round Robin

Aurora Tigers defeated Soo Thunderbirds (NOJHL) 3-1

Aurora Tigers defeated Fort William North Stars (SIJHL) 4-0

Aurora Tigers defeated North Bay Skyhawks (NOJHL) 5-1

Final

Aurora Tigers defeated North Bay Skyhawks (NOJHL) 5-1

Hosted by Grande Prairie Storm in Grande Prairie, Alberta. Aurora Tigers won the event.^[2]

Round Robin

Grande Prairie Storm (AJHL) defeated Aurora Tigers 4-2

Aurora Tigers defeated Nanaimo Clippers (BCHL) 4-2

Aurora Tigers defeated Kindersley Klippers (SJHL) 5-0

Aurora Tigers defeated Nepean Raiders (CJHL) 3-1

Semi-final

Aurora Tigers defeated Nepean Raiders (CJHL) 7-2

Final

Aurora Tigers defeated Kindersley Klippers (SJHL) 7-1

• Rd 7 #201 Michael Vernace - San Jose Sharks (Bramalea Blues)

• 2004 Royal Bank Cup
• Dudley Hewitt Cup
• List of OJHL seasons
• Northern Ontario Junior Hockey League
• Superior International Junior Hockey League
• Greater Ontario Junior Hockey League
• 2003 in ice hockey
• 2004 in ice hockey

• Official website of the Ontario Junior Hockey League
• Official website of the Canadian Junior Hockey League