2009 Atlantic Sun men's basketball tournament

The 2009 Atlantic Sun men's basketball tournament took place from March 4–7, 2009 at Allen Arena in Nashville, Tennessee.

Format
The seven eligible men's basketball teams in the Atlantic Sun Conference receive a berth in the conference tournament. After the 20 game conference season, teams are seeded by conference record. The winner of the tournament receives an automatic bid to the NCAA tournament. The #1 seed, if not tournament champions, will receive an automatic bid to the NIT.