| Year: | 2009 |
| Conference: | Missouri Valley Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 10 |
| Arena: | Scottrade Center |
| City: | St. Louis, Missouri |
| Champions: | Northern Iowa |
| Titlecount: | 2nd |
| Coach: | Ben Jacobson |
| Coachcount: | 1st |
| Mvp: | Osiris Eldridge[1] |
| Mvpteam: | Illinois State |
| Television: | FSN Midwest, CBS |
Popularly referred to as "Arch Madness", the 2009 Missouri Valley Conference men's basketball tournament as part of the 2008–09 NCAA Division I men's basketball season was played in St. Louis, Missouri March 5–8, 2009.[2] The tournament was won by the Northern Iowa Panthers, who received the Missouri Valley Conference's automatic bid to the 2009 NCAA Men's Division I Basketball Tournament.