The 2018 Ontario Tankard, known as the Dairy Farmers of Ontario Tankard for sponsorship reasons is the 2018 provincial men's curling championship for Southern Ontario, was held from January 31 to February 4 at the in Huntsville, Ontario. The winning John Epping team represented Ontario at the 2018 Tim Hortons Brier in Regina, Saskatchewan. The event had a triple knock out format, rather than the traditional round robin event as done in previous years. The number of qualified teams increased from 10 to 12.