The 2009 Atlantic Coast Conference men's basketball tournament took place from March 12–15 at the Georgia Dome in Atlanta. The tournament was broadcast on the ESPN family of networks, along with Raycom Sports in the ACC footprint. The championship game matched Duke against Florida State, who made their first appearance in the ACC championship game since joining the league in 1992. Duke won 79–69 for their 8th conference title in 11 years.