2012–13 OHL season

The 2012–13 OHL season was the 33rd season of the Ontario Hockey League. The Mississauga St. Michael's Majors were sold during the off-season. As part of the sale, the "St. Michael's Majors" name was returned to St. Michael's College School. The new name of the team will be the Mississauga Steelheads. The Brampton Battalion announced during the season that this would be their last season in Brampton and will relocate to North Bay, Ontario for the 2013–14 OHL season. Twenty teams played 68 games each during the regular season schedule, which began in September 2012 and ended in March 2013. The London Knights won their second consecutive J. Ross Robertson Cup and third in franchise history, and with it a berth in the 2013 Memorial Cup hosted by the Saskatoon Blades of the WHL.

Final standings
Note: DIV = Division; 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

Scoring leaders
Note: GP = Games played; G = Goals; A = Assists; Pts = Points; PIM = Penalty minutes

Leading goaltenders
Note: GP = Games played; Mins = Minutes played; W = Wins; L = Losses: OTL = Overtime losses; SL = Shootout losses; GA = Goals Allowed; SO = Shutouts; GAA = Goals against average

Playoff scoring leaders
Note: GP = Games played; G = Goals; A = Assists; Pts = Points; PIM = Penalty minutes

Playoff leading goaltenders
Note: GP = Games played; Mins = Minutes played; W = Wins; L = Losses: OTL = Overtime losses; SL = Shootout losses; GA = Goals Allowed; SO = Shutouts; GAA = Goals against average

All-Star teams
The OHL All-Star Teams were selected by the OHL's General Managers.

First team

 * Vincent Trocheck, Centre, Plymouth Whalers
 * Reid Boucher, Left Wing, Sarnia Sting
 * Seth Griffith, Right Wing, London Knights
 * Ryan Sproul, Defence, Sault Ste. Marie Greyhounds
 * Scott Harrington, Defence, London Knights
 * Jordan Binnington, Goaltender, Owen Sound Attack
 * Mike Vellucci, Coach, Plymouth Whalers

Second team

 * Charles Sarault, Centre, Sarnia Sting
 * Garret Ross, Left Wing, Saginaw Spirit
 * Brett Ritchie, Right Wing, Niagara IceDogs
 * Cody Ceci, Defence, Owen Sound Attack
 * Ryan Murphy, Defence, Kitchener Rangers
 * John Gibson, Goaltender, Kitchener Rangers
 * George Burnett, Coach, Belleville Bulls

Third team

 * Boone Jenner, Centre, Oshawa Generals
 * Anthony Camara, Left Wing, Barrie Colts
 * Cameron Brace, Right Wing, Owen Sound Attack
 * Dylan DeMelo, Defence, Mississauga Steelheads
 * Colin Miller, Defence, Sault Ste. Marie Greyhounds
 * Malcolm Subban, Goaltender, Belleville Bulls
 * D. J. Smith, Coach, Oshawa Generals

2013 OHL Priority Selection
On April 6, 2013, the OHL conducted the 2013 Ontario Hockey League Priority Selection. The Ottawa 67's held the first overall pick in the draft, and selected Travis Konecny from the Elgin-Middlesex Chiefs. Konecny 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 2013 Ontario Hockey League Priority Selection.

2013 NHL Entry Draft
On June 30, 2013, the National Hockey League conducted the 2013 NHL Entry Draft held at the Prudential Center in Newark, New Jersey. In total, 37 players from the Ontario Hockey League were selected in the draft. Sean Monahan of the Ottawa 67's was the first player from the OHL to be selected, as he was taken with the sixth overall pick by the Calgary Flames.

Below are the players selected from OHL teams at the NHL Entry Draft.

2013 CHL Import Draft
On July 3, 2013, the Canadian Hockey League conducted the 2013 CHL Import Draft, in which teams in all three CHL leagues participate in. The Ottawa 67's held the first pick in the draft by a team in the OHL, and selected Alex Lintuniemi from Finland with their selection.

Below are the players who were selected in the first round by Ontario Hockey League teams in the 2013 CHL Import Draft.