| Mode: | Basketball |
| Year: | 2009–10 |
| Team: | Saint Louis Billikens |
| Conference: | Atlantic 10 Conference |
| Short Conf: | A-10 |
| Record: | 23 - 13 |
| Conf Record: | 11 - 5 |
| Asst Coach2: | Chris Harriman |
| Bowl Result: | Finals |
The 2009–10 Saint Louis Billikens men's basketball team represented Saint Louis University in the 2009–10 college basketball season. This was head coach Rick Majerus's third season at Saint Louis. The Billikens compete in the Atlantic 10 Conference and played their home games at Chaifetz Arena. They finished the season 23 - 13, 11 - 5 in A-10 play and lost in the quarterfinals of the 2010 Atlantic 10 men's basketball tournament. They were invited to the 2010 College Basketball Invitational where they advanced to the best-of-3 games final. They lost 0 - 2 to VCU.
| NO | Name | Position | Height | Weight | Year | Hometown (Last School) | ||
| 3 | Kwamain Mitchell | Guard | 5-10 | 175 | SO | Milwaukee, Wisconsin (Dominican) | ||
| 10 | Paul Eckerle | Guard | 6-1 | 175 | JR | Washington, Missouri (St. Francis Borgia) | ||
| 12 | Justin Jordan | Guard | 5-9 | 179 | FR | Fort Wayne, Indiana (North Side) | ||
| 13 | Femi John | Guard | 6-2 | 205 | RS FR | St. Louis, Missouri (McCluer North) | ||
| 14 | Brian Conklin | Forward | 6-6 | 230 | SO | North Eugene, Oregon (North Eugene) | ||
| 15 | Christian Salecich | Guard | 6-3 | 190 | FR | Gold Coast, Australia (Australian Institute of Sport) | ||
| 20 | Darrin Young | Guard | 5-10 | 165 | FR | Kirkwood, Missouri (Kirkwood) | ||
| 21 | Jon Smith | Forward | 6-5 | 190 | FR | Columbus, Ohio (Grove City) | ||
| 22 | Jeff Reid | Guard | 6-4 | 185 | FR | Topeka, Kansas (Hayden) | ||
| 23 | Kyle Cassity | Guard | 6-3 | 200 | SO | Tamaroa, Illinois(Pinckneyville) | ||
| 24 | Cody Ellis | Forward | 6-8 | 240 | FR | Perth, Australia (Australian Institute of Sport) | ||
| 32 | Cory Remekun | Forward | 6-7 | 205 | FR | Dallas, Texas (Mesquite)) | ||
| 33 | Willie Reed | Forward | 6-9 | 220 | SO | Kansas City, Missouri (Bishop Miege) |
|-!colspan=9 style=| Exhibition|-!colspan=9 style=| Regular Season|-!colspan=9 style=| Atlantic 10 tournament|-!colspan=9 style=| CBI