The 2011–12 OHL season was the 32nd season of the Ontario Hockey League. Twenty teams played 68 games each during the regular season schedule, which started on September 21, 2011 and ended on March 18, 2012. The playoffs began on Thursday March 22, 2012 and concluded on Friday May 11, 2012. The London Knights won the J. Ross Robertson Cup for the second time in franchise history. London secured a berth in the 2012 Memorial Cup hosted by the Shawinigan Cataractes of the QMJHL.