The 2004 Atlantic Coast Conference Men's Basketball Tournament took place from March 11–14 in Greensboro, North Carolina, at the Greensboro Coliseum. The Maryland Terrapins won the tournament as the #6 seed, upsetting #3 seed Wake Forest, #2 seed NC State, and top seed Duke in succession on their way to the championship. It was Maryland's third tournament title, and their first since 1984. Maryland's John Gilchrist won the Most Valuable Player award. Maryland's championship ended Duke's streak of five straight ACC championships.