The 2003 Big Ten Conference baseball tournament was held at Siebert Field on the campus of the University of Minnesota in Minneapolis, Minnesota, from May 15 through 19.
The top six teams from the regular season participated in the double-elimination tournament, the twenty second annual tournament sponsored by the Big Ten Conference to determine the league champion.
Ohio State won their sixth tournament championship and earned the Big Ten Conference's automatic bid to the 2003 NCAA Division I baseball tournament.
Teams that lost in the opening round played an elimination game.
[3] Brett Garrard was named Most Outstanding Player.