The 2005 Atlantic Coast Conference Men's Basketball Tournament took place from March 10-13, 2005 in Washington, D.C. at the MCI Center. This was the first time the tournament was played inside The Nation's Capital, as all of the previous ACC Tournaments in the D.C. area were played in suburban Landover, MD at the Capital Center. Duke won the tournament, defeating Georgia Tech in the championship game. Duke's J.J. Redick won the tournament's Most Valuable Player award. North Carolina came in as the top-seeded team. However, they lost in the semifinal to Georgia Tech.