The 2003–04 OHL season was the 24th season of the Ontario Hockey League. In November 2003, the OHL Board of Governors renamed the OHL Humanitarian of the Year Award to the Dan Snyder Memorial Trophy, in recognition of former Owen Sound Platers player, Dan Snyder, who died in a car accident in September 2003. Twenty teams each played 68 games. The J. Ross Robertson Cup was won by the Guelph Storm, who swept the Mississauga IceDogs in the league final.

Regular season

Final standings

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

Eastern conference

Western conference

Scoring leaders

Playoffs

Conference quarterfinals

Eastern conference

Western conference

Conference semifinals

Conference finals

J. Ross Robertson Cup finals

J. Ross Robertson Cup Champions Roster

All-Star teams

First team

Second team

Third team

CHL Canada/Russia Series

In the RE/MAX Canada-Russia Challenge, the OHL All-stars defeated the Russian Selects 7–1 at London, Ontario, on November 17, and the OHL All-stars defeated the Russian Selects 4–0 at Sarnia, Ontario, on November 19.

Awards

2004 OHL Priority Selection

On May 1, 2004, the OHL conducted the 2004 Ontario Hockey League Priority Selection. The Belleville Bulls held the first overall pick in the draft, and selected John Hughes from the Whitby Wildcats. Hughes was awarded the Jack Ferguson Award, awarded to the top pick in the draft. Below are the players who were selected in the first round of the 2004 Ontario Hockey League Priority Selection.

2004 CHL Import Draft

On June 30, 2004, the Canadian Hockey League conducted the 2004 CHL Import Draft, in which teams in all three CHL leagues participate in. The Owen Sound Attack held the first pick in the draft by a team in the OHL, and selected Andrej Sekera from Slovakia with their selection. Below are the players who were selected in the first round by Ontario Hockey League teams in the 2004 CHL Import Draft.