| Year: | 1998 |
| Conference: | MAC |
| Gender: | Men's |
| Teams: | 8 |
| Arena: | On-campus sites (quarterfinal round) SeaGate Centre |
| City: | Toledo, Ohio |
| Champions: | Eastern Michigan |
| Titlecount: | 4th |
| Coach: | Milton Barnes |
| Coachcount: | 1st |
| Mvp: | Earl Boykins |
| Mvpteam: | Eastern Michigan |
The 1998 MAC men's basketball tournament, a part of the 1997–98 NCAA Division I men's basketball season, took place at campus sites for the quarterfinal round with the semifinals and final held at SeaGate Centre in Toledo, Ohio. Its winner received the Mid-American Conference's automatic bid to the 1998 NCAA tournament. It was a single-elimination tournament with three rounds and the top eight MAC teams invited to participate. No teams received byes in the tournament. Ball State, the MAC West Division co-champion, received the number one seed in the tournament.