The 1999 Big Ten men's basketball tournament was the second annual postseason men's basketball tournament for the Big Ten Conference and was played from March 4 through March 7, 1999, at the United Center in Chicago, Illinois.

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

[4] Ohio State also vacated its appearance in the tournament due to NCAA Sanctions.

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.