The Jackson Convicts were a minor league baseball team based in Jackson, Michigan. From 1906 to 1915, Jackson teams played as members of the Southern Michigan League for the duration of the league but did not claim a league championship in their tenure. In 1914 and 1915, Jackson played one season each known as the "Chiefs" and "Vets." Jackson teams hosted home minor league teams at Keeley Park. The team "Convicts" nickname corresponded to Jackson serving as home to the Michigan State Prison in the era.

The Tri-State League was the name of six different circuits in American minor league baseball.