The 1966 Atlantic Coast Conference Men's Basketball Tournament was held in Raleigh, North Carolina at Reynolds Coliseum from March 3-5, 1966. Duke defeated NC State 71-66 to win the championship for the fourth time. Steve Vacendak of Duke was named tournament MVP. This was the last ACC Tournament held at Reynolds Coliseum.
| Quarterfinals March 3, 1966 |
Semifinals March 4, 1966 |
Championship Game March 5, 1966 |
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| 1 | Duke | 103 | |||||||||||
| 8 | Wake Forest | 73 | |||||||||||
| 1 | Duke | 21 | |||||||||||
| 4 | North Carolina | 20 | |||||||||||
| 4 | North Carolina | 77 | |||||||||||
| 5 | Maryland | 70 | |||||||||||
| 1 | Duke | 71 | |||||||||||
| 2 | NC State | 66 | |||||||||||
| 2 | NC State | 86 | |||||||||||
| 7 | Virginia | 77 | |||||||||||
| 2 | NC State | 75 | |||||||||||
| 6 | South Carolina | 62 | |||||||||||
| 3 | Clemson | 52 | |||||||||||
| 6 | South Carolina | 60 | |||||||||||
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