Mount Forest is an unincorporated community located at the junction of Highway 6 and Highway 89 in the township of Wellington North, Ontario, Canada. As of the 2011 Canadian census the population of Mount Forest was 4,757.

King's Highway 6, commonly referred to as Highway 6, is a provincially maintained highway in the Canadian province of Ontario. It crosses a distance of 480 km (300 mi) between Port Dover, on the northern shore of Lake Erie, and Espanola, on the northern shore of Lake Huron, before ending at the Trans-Canada Highway (Highway 17) in McKerrow.