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.