| Year: | 1989 |
| Conference: | Midwestern Collegiate Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 7 |
| Arena: | UD Arena |
| City: | Dayton, Ohio |
| Champions: | Xavier |
| Titlecount: | 5th |
| Coach: | Pete Gillen |
| Coachcount: | 4th |
| Mvp: | Tyrone Hill |
| Mvpteam: | Xavier |
The 1989 Midwestern Collegiate Conference men's basketball tournament (now known as the Horizon League men's basketball tournament) was held March 9–11 at UD Arena in Dayton, Ohio.[1]
Xavier defeated Evansville in the championship game, 85–78, to win their fourth consecutive (fifth overall) MCC/Horizon League men's basketball tournament.
The Musketeers received an automatic bid to the 1989 NCAA tournament as the #14 seed in the Southeast region. Evansville received an at-large bid as the #11 seed in the West region. Xavier lost to the eventual national champion, Michigan, in the first round. Evansville defeated Oregon State, before losing to eventual national runner-up Seton Hall in the second round.
All seven conference members participated in the tournament and were seeded based on regular season conference records, with the top seed (Evansville) earning a bye into the semifinal round.