The 2013 Dominion Tankard, southern Ontario's men's provincial curling championship, was held from February 4 to 10 at the Barrie Molson Centre in Barrie, Ontario.

The winning team of Glenn Howard represented Ontario at the 2013 Tim Hortons Brier in Edmonton, Alberta.

Howard won his 15th provincial championship, and continued his record 8th straight title by defeating Joe Frans in the final.

As defending champions, the Glenn Howard rink from the Coldwater and District Curling Club get an automatic berth in the Tankard.

Regional Qualifiers In Bold December 7–9, at the RCMP Curling Club, Ottawa Teams entered: December 7–9, at the RCMP Curling Club, Ottawa Teams entered: December 7–9, at the Arnprior Curling Club, Arnprior Teams entered: December 7–9, at the Royal Kingston Curling Club, Kingston Teams entered: December 7–9, at the Fenelon Falls Curling Club, Fenelon Falls Teams entered: December 8–11, at the Oshawa Curling Club, Oshawa Teams entered: December 7–9, at the Bayview Golf & Country Club, Thornhill Teams entered: December 8–9, at the St. George's Golf & Country Club, Toronto Teams entered: December 7–9, at the Markdale Golf & Curling Club, Markdale Teams entered: December 7–9, at the Bradford & District Curling Club, Bradford Teams entered: December 7–9, at the Chesley Curling Club, Chesley Teams entered: November 30-December 2, at the Elora Curling Club, Elora Teams entered: December 7–9, at the Glendale Golf & Country Club, Hamilton Teams entered: December 7–9, at the Listowel Curling Club, Listowel Teams entered: December 7–9, at the Aylmer Curling Club, Aylmer Teams entered: December 7–9, at the Forest Curling & Social Club, Forest Teams entered: January 5–6 , Carleton Place Curling Club, Carleton Place January 5–6 , High Park Club, Toronto January 5–6 , Elmira & District Curling Club, Elmira January 5–6 , Glencoe and District Curling Club, Glencoe January 11–14, at the Orangeville Curling Club in Orangeville