| Year: | 1990 |
| Conference: | Big East |
| Gender: | Men's |
| Teams: | 9 |
| Arena: | Madison Square Garden |
| City: | New York City |
| Champions: | Connecticut |
| Titlecount: | 1st |
| Coach: | Jim Calhoun |
| Coachcount: | 1st |
| Mvp: | Chris Smith |
| Mvpteam: | Connecticut |
The 1990 Big East men's basketball tournament took place at Madison Square Garden in New York City, from March 8 to March 11, 1990. Its winner received the Big East Conference's automatic bid to the 1990 NCAA tournament. It is a single-elimination tournament with four rounds. Syracuse and Connecticut tied for the best regular-season conference record. Based on tie-breakers, Syracuse was awarded the #1 seed.
Connecticut defeated Syracuse in the championship game 78 - 75, to claim its first Big East tournament championship.
Dave Gavitt Trophy (Most Valuable Player): Chris Smith, Connecticut
All-Tournament Team