The 2004 Big Ten men's basketball tournament was the postseason men's basketball tournament for the Big Ten Conference and was played between March 11 and March 14, 2004 at Conseco Fieldhouse in Indianapolis, Indiana. The championship was won by Wisconsin who defeated Illinois in the championship game. As a result, Wisconsin received the Big Ten's automatic bid to the NCAA tournament. The win marked Wisconsin's first win in their first appearance in the championship game. It also marked the first time in tournament history that the top two seeds appeared in the championship game.
All Big Ten schools played in the tournament. Teams were seeded by conference record, with a tiebreaker system used to seed teams with identical conference records. Seeding for the tournament was determined at the close of the regular conference season. The top five teams received a first round bye.
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