List of Midwest League champions
The Midwest League of Minor League Baseball is one of three High-A baseball leagues in the United States. It was previously known as the Illinois State League from 1947 to 1948 and as the Mississippi-Ohio Valley League form 1949 to 1955, but has been the Midwest League since 1956 (with the exception of 2021 when known as the High-A Central). A league champion is determined at the end of each season. Champions have been determined by postseason playoffs, winning the regular season pennant, or being declared champion by the league office. As  of 2019, eight teams qualified for the postseason: the first- and second-half winners within each division, Eastern and Western, and wild card teams (the teams with the best second-place record) from each half in each division. Teams within each division met in a best-of-three quarterfinal round. The winners met in a best-of-three semifinal series to determine division champions. Then, the Eastern and Western division winners play a best-of-five series to determine a league champion. Championship wins by team. Active Midwest League teams appear in bold.