The Ontario Tankard is the Southern Ontario provincial championship for men's curling. The winner represents Team Ontario at the Montana's Brier. The tournament is overseen by CurlON (formerly the Ontario Curling Association). Northern Ontario has its own provincial championship, known as the Northern Ontario Men's Provincial Curling Championship. This championship is not to be confused with the Silver Tankard, historically also known as the Ontario Tankard (and until 1937 a Brier qualifier).

Qualification

Since 2017, the qualification has varied from year to year: Between 1972 and 2016, the event usually had 10 teams: Two teams from each of the four OCA regions, and one winner each from an eastern and western challenge round. When Ontario won the previous Brier, that team would be added to the field for the following season. In 1999, when Ontario had not only won the previous Brier, but an Ontario team also won the 1997 Canadian Olympic Curling Trials, the field was expanded to 12 teams, giving them an automatic berth.

Format

The format of the Tankard has differed each year since 2018: From 1972 to 1981, the tournament was a strict round robin affair, with the team with the best record being crowned champion (a tiebreaker would be held if necessary). From 1981 to 2000, the tournament consisted of a round robin followed by a three team playoff. In 2001, the playoff was replaced with a four team page playoff.

Former Names

Brier representatives

Listed below are the list of Ontario's representatives at the Brier that year. Brier champions indicated in bold. From 1927 to 1931, Toronto had a separate entry at the Brier.

1927–1931

From 1927 to 1931, teams representing Ontario at the Brier were selected from the winning club at the Ontario Silver Tankard, a double rink event which has taken place since 1875.

1932–1980

There was no Brier from 1943 to 1945 due to World War II. Listed here for those years are the winners of the British Consols, the usual Brier qualifying event.

1981–present

A playoff was added to the event in 1981. The 2021 Tankard was cancelled due to the COVID-19 pandemic in Ontario.