| Year: | 1990 |
| Conference: | Big South Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 7 |
| Arena: | Winthrop Coliseum |
| City: | Rock Hill, SC |
| Champions: | Coastal Carolina |
| Titlecount: | 1st |
| Coach: | Russ Bergman |
| Coachcount: | 1st |
| Mvp: | Milton Moore |
| Mvpteam: | UNC Asheville |
The 1990 Big South Conference men's basketball tournament took place March 1–3, 1990, at the Winthrop Coliseum in Rock Hill, South Carolina. For the first time in their school history, the Coastal Carolina Chanticleers won the tournament, led by head coach Russ Bergman.[1]
All of the conference's seven members participated in the tournament, hosted at the Winthrop Coliseum, home of the Winthrop Eagles. Teams were seeded by conference winning percentage.
* Asterisk indicates overtime game