The Ontario Baseball Association was founded under the name "Ontario Baseball Amateur Association" which was organized at a meeting held in Hamilton at the Central YMCA on Saturday, May 4, 1918.

In 1938, the name was changed to "Ontario Baseball Association", and in 1982, the organization was incorporated as "Ontario Baseball Association, Inc".

[1][non-primary source needed] In 2013, Baseball Ontario was named Province of the Year by Baseball Canada due, in large part to the eight medals won by Ontario teams at National Championships.

Ontario medaled in all seven tournaments, winning gold at the Bantam Girls, Bantam Boys, Midget, Junior, Senior Women's and Senior Men's tournaments in addition to a silver medal at the Baseball Canada Cup and a bronze at the Senior Men's tournament.

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