In 1981 the Big Ten Conference baseball tournament was established to decide its champion.
In 1988 the conference went back to a single division but still used the tournament to determine the champion.
In 1993 the conference returned to using the regular season to name its champion while the team that wins the tournament receives the automatic bid to the NCAA Division I Baseball Championship.
These are the official Big Ten champions based on standings, the system used from 1896 to 1980 and from 1993 to the present.
Italics indicates a team no longer competing in baseball in the Big Ten.