The 1989 AMCU-8 men's basketball tournament was held March 6–8, 1989, at the John Q. Hammons Student Center at Southwest Missouri State University in Springfield, Missouri.
[1] Southwest Missouri State defeated Illinois–Chicago in the title game, 73–67, to win their second AMCU-8 championship.
The Bears earned an automatic bid to the 1989 tournament as the #14 seed in the West region where they lost 60–51 in the opening round to eventual national runner-up Seton Hall.
The top seed, Southwest Missouri State, was given a bye to the semifinal round.
The other six teams were paired in the quarterfinal round with seedings based on regular season record.