The Intercounty Baseball League (IBL) was founded in 1919 with just four cities represented —
Galt,
Guelph,
Stratford and
Kitchener, and is the oldest amateur men's league in Canada. During the early years, the league expanded to include the cities of
Waterloo,
Brantford,
Preston,
London, and
St. Thomas. It was previously known as the Intercounty Major Baseball League and the Senior Intercounty Baseball League. Teams compete for the Jack and Lynne Dominico Trophy, which is awarded to the league champions. The trophy is named for the late owners of the
Toronto Maple Leafs baseball team, husband and wife Jack and Lynne Dominico. On December 3, 2024, the
Toronto Maple Leafs announced they had signed
Ayami Sato, making her the first female player in the league as well as the first female player chosen to play professional baseball in Canada. She began playing on May 11, 2025. In 2025, IBL commissioner Ted Kalnins stated that league was transitioning from being a semi-professional to fully professional league and would be expanding to a total of 10 teams as a part of that effort. In addition to being a fully professional league, the league would now be known as the Canadian Baseball League and see the amount of regular season games played increase from 42 to 48, as well as a 5-team playoff structure. Further changes to the league are set to be announced in by the end of 2025. Barrie hosted the league's All-Star Game on July 11, 2015, with the IBL All-Stars defeating
Barrie Baycats 13–4. Following a several-year hiatus the IBL announced they will be hosting a mid summer classic on July 20, 2024 in Welland.
All-Star Game results (2024 - present) Transition to "Canadian Baseball League" On November 24, 2025, the league announced that, beginning with the 2026 season, the league would be changing its name from the Intercounty Baseball League, which had been in use since the league's founding in 1919, to the Canadian Baseball League. The change was made due, in part, to the growing popularity of the league across the country, as well as the move from its former semi-professional standing to a fully professional structure. The league also announced that it would be expanding its regular season from 42 games to 48, and setting the number of playoff teams at five. Under the new playoff system, the fourth- and -fifth place teams will play in a win-or-go-home one-game playoff, followed by the remaining teams playing in two best-of-seven series to determine the winner of the Dominico Cup. == Teams ==