2003 Big Ten baseball tournament

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. won their sixth tournament championship and earned the Big Ten Conference's automatic bid to the 2003 NCAA Division I baseball tournament.

Format and seeding
The 2003 tournament was a 6-team double-elimination tournament, with seeds determined by conference regular season winning percentage only. Using the same format from 2002, the top two seeds received a single bye, with the four lower seeds playing opening round games. The top seed played the lowest seeded winner from the opening round, with the second seed playing the higher seed. Teams that lost in the opening round played an elimination game.

All-Tournament Team
The following players were named to the All-Tournament Team.

Most Outstanding Player
Brett Garrard was named Most Outstanding Player. Garrard was a shortstop for Ohio State.