The 2009 Atlantic Sun Conference Baseball Tournament was held at Melching Field at Conrad Park on the campus of Stetson University in DeLand, Florida from May 21 through 24. Jacksonville won its fourth tournament championship to earn the Atlantic Sun Conference's automatic bid to the 2009 NCAA Division I Baseball Tournament. The event was heavily marred by rain, resulting in two format changes. Originally planned as a six team double-elimination tournament, the format was changed to a single elimination format.