The 1998 Big Ten men's basketball tournament was the inaugural postseason men's basketball tournament for the Big Ten Conference and was played from March 5 through March 8, 1998 at the United Center in Chicago, Illinois.

[1] As a result, Michigan received the Big Ten's automatic bid to the NCAA tournament.

[3] All 11 Big Ten schools participated 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.