| Year: | 2003 |
| Conference: | ACC |
| Gender: | Men's |
| Teams: | 9 |
| Arena: | Greensboro Coliseum |
| City: | Greensboro, North Carolina |
| Champions: | Duke |
| Titlecount: | 14th |
| Coach: | Mike Krzyzewski |
| Coachcount: | 8th |
| Mvp: | Daniel Ewing |
| Mvpteam: | Duke |
The 2003 Atlantic Coast Conference men's basketball tournament took place from March 13 to 16 in Greensboro, North Carolina, at the Greensboro Coliseum. The 2003 edition marked the 50th ACC Tournament. Duke won the tournament for the fifth straight time, defeating NC State in the championship game for the second year in a row. Duke's Daniel Ewing won the tournament's Most Valuable Player award.
AP Rankings at time of tournament