| Mode: | Basketball |
| Year: | 2008–09 |
| Prev Year: | 2007–08 |
| Next Year: | 2009–10 |
| Team: | Saint Louis Billikens |
| Conference: | Atlantic 10 Conference |
| Short Conf: | A-10 |
| Record: | 18–14 |
| Conf Record: | 8–8 |
| Stadium: | Chaifetz Arena |
The 2008–09 Saint Louis Billikens men's basketball team represented Saint Louis University in the 2008–09 college basketball season. This was head coach Rick Majerus's second season at Saint Louis. The Billikens competed in the Atlantic 10 Conference. It was also the Billikens first season in which they played their home games at Chaifetz Arena. They finished the season 18–14 and 8–8 in A-10 play.
| NO | Name | Position | Height | Weight | Year | Hometown (Last School) | ||
| 3 | Kwamain Mitchell | Guard | 5-10 | 165 | FR | Milwaukee, WI (Dominican) | ||
| 10 | Paul Eckerle | Guard | 6-1 | 185 | SO | Washington, Mo. (St. Francis Borgia) | ||
| 12 | Femi John | Guard | 6-2 | 190 | FR | St. Louis, MO (McCluer North) | ||
| 14 | Brian Conklin | Forward | 6-6 | 220 | FR | North Eugene, Ore. (North Eugene) | ||
| 15 | Barry Eberhardt | Forward | 6-6 | 250 | SR | Inkster, Mich. (Coffeyville CC | ||
| 20 | Daniel Lisch | Guard | 6-2 | 185 | FR | Belleville, Ill. (West) | ||
| 21 | Kevin Lisch | Guard | 6-2 | 190 | SR | Belleville, Ill. (Althoff) | ||
| 22 | Jonathan Parker | Guard | 6-3 | 180 | FR | Milwaukee Wis. (Marquette U. High) | ||
| 23 | Kyle Cassity | Guard | 6-3 | 185 | FR | Pinckneyville, Ill. (Pinckneyville) | ||
| 25 | Tommie Liddell | Guard | 6-4 | 195 | SR | East St. Louis, Ill. (Hargrave Military Academy) | ||
| 33 | Willie Reed | Forward | 6-9 | 195 | FR | Kansas City, Mo. (Bishop Miege) | ||
| 41 | Brett Thompson | Center | 6-10 | 260 | FR | Vienna, Ill. (Vienna) | ||
| 44 | Andre Craig | Guard | 6-3 | 175 | FR | St. Louis, Mo. (SLUH) |