| Year: | 2003 |
| Conference: | Big West Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 8 |
| Arena: | Anaheim Convention Center |
| City: | Anaheim, CA |
| Champions: | Utah State |
| Titlecount: | 5th |
| Coach: | Stew Morrill |
| Coachcount: | 3rd |
| Mvp: | Desmond Penigar |
| Mvpteam: | Utah State |
The 2003 Big West Conference men's basketball tournament was held March 13–15 at Anaheim Convention Center in Anaheim, California.[1]
Utah State defeated in the championship game, 57–54, to obtain the fifth Big West Conference men's basketball tournament championship in school history.
The Aggies participated in the 2003 NCAA Division I men's basketball tournament after earning the conference's automatic bid.
Eight of the ten teams in the conference participated, with and not qualifying. Teams were seeded based on regular season conference records.