| Year: | 2009 |
| Conference: | Big West Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 8 |
| Arena: | Anaheim Convention Center Arena |
| City: | Anaheim, California |
| Champions: | Cal State Northridge |
| Titlecount: | 1st |
| Coach: | Bobby Braswell |
| Coachcount: | 1st |
| Mvp: | Rodrigue Mels |
| Mvpteam: | Cal State Northridge |
The 2009 Big West Conference men's basketball tournament took place in March 2009.
The top two seeds receive byes into the semifinals. Seeds 3 and 4 receive byes into the quarterfinals. If necessary, the bracket will be adjusted after each round so that the top and bottom seeds in each round play in the same game. The ninth place team, Cal Poly, did not receive a tournament invitation.