| Year: | 1991 |
| Conference: | Big East |
| Gender: | Men's |
| Teams: | 9 |
| Arena: | Madison Square Garden |
| City: | New York City |
| Champions: | Seton Hall |
| Titlecount: | 1st |
| Coach: | P. J. Carlesimo |
| Coachcount: | 1st |
| Mvp: | Oliver Taylor |
| Mvpteam: | Seton Hall |
The 1991 Big East men's basketball tournament took place at Madison Square Garden in New York City, from March 7 to March 10, 1991. Its winner received the Big East Conference's automatic bid to the 1991 NCAA tournament. It is a single-elimination tournament with four rounds. Syracuse finished with the best regular season conference record and was awarded the #1 seed.
Seton Hall defeated Georgetown in the championship game 74 - 62, to claim its first Big East tournament championship.
Dave Gavitt Trophy (Most Valuable Player): Oliver Taylor, Seton Hall
All Tournament Team