2009 ACC men's basketball tournament

The 2009 Atlantic Coast Conference men's basketball tournament took place from March 12 to 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.

Seeding
Teams were seeded based on the final regular-season standings, with ties broken under an ACC policy.

Wake Forest and Duke split their regular-season games, each winning one. Wake Forest was awarded the second seed for its better record against top-seeded North Carolina: Wake won its only game, while Duke lost both games.

By finishing fourth in the conference, Florida State joined North Carolina, Duke and Wake Forest as teams that received a first-round bye in the tournament. It was the first time that the Seminoles had earned a bye since joining the conference in time for the 1991-92 season.

Clemson received the fifth seed because it beat Boston College in their only meeting.

The three-way tie among Maryland, Virginia Tech, and Miami was broken based on the record of games played among the three teams. Maryland received the seventh seed for having the best winning percentage (2–1), Virginia Tech received the eighth seed (1–1), and Miami received the ninth seed (1–2).

Awards and honors
Tournament MVP All-Tournament Team
 * Jon Scheyer - Duke

First Team
 * Jon Scheyer - Duke
 * Toney Douglas - Florida State
 * Kyle Singler - Duke
 * Tyler Hansbrough - North Carolina
 * Gerald Henderson - Duke

Second Team
 * Solomon Alabi - Florida State
 * Wayne Ellington - North Carolina
 * Eric Hayes - Maryland
 * Greivis Vasquez - Maryland
 * Lewis Clinch - Georgia Tech