1990–91 Boston Celtics season Playoffs Conference Semi-finals

| Game | Date_ | Team | Score | High_points | High_rebounds | High_assists | Location_Attendance | Series |
|---|---|---|---|---|---|---|---|---|
| 1 | May 7 | Detroit Pistons | L 75-86 | R. Lewis (20) | K. McHale (10) | B. Shaw (5) | Boston Garden | 0-1 |
| 2 | May 9 | Detroit Pistons | W 109-103 | R. Lewis (23) | R. Parish (13) | D. Brown (8) | Boston Garden | 1-1 |
| 3 | May 11 | @ Detroit Pistons | W 115-83 | R. Lewis (21) | R. Parish (11) | D. Brown , K. McHale (6) | The Palace of Auburn Hills | 2-1 |
| 4 | May 13 | @ Detroit Pistons | L 97-104 | K. McHale (28) | R. Parish (10) | B. Shaw (6) | The Palace of Auburn Hills | 2-2 |
| 5 | May 15 | Detroit Pistons | L 111-116 | R. Lewis (30) | R. Lewis (11) | D. Brown (10) | Boston Garden | 2-3 |