The 2018–19 OHL season was the 39th season of the Ontario Hockey League, in which twenty teams played 68 games each according to the regular season schedule, from September 19, 2018 to March 17, 2019. The Guelph Storm won the J. Ross Robertson Cup as they defeated the Ottawa 67's in six games to represent the Ontario Hockey League in the 2019 Memorial Cup, which was hosted by the Halifax Mooseheads of the QMJHL at the Scotiabank Centre in Halifax, Nova Scotia from May 17–26, 2019.