1965–66 Boston Celtics season Game log January

| Game | Date_ | Opponent | Score | Location_Attendance | Record |
|---|---|---|---|---|---|
| 34 | January 1 | @ St. Louis Hawks | 98–100 | St. Louis Arena | 24–10 |
| 35 | January 2 | @ Los Angeles Lakers | 124–113 | Los Angeles Memorial Sports Arena | 25–10 |
| 36 | January 5 | @ Los Angeles Lakers | 113–120 | Los Angeles Memorial Sports Arena | 25–11 |
| 37 | January 7 | @ San Francisco Warriors | 115–114 | San Francisco Civic Auditorium | 26–11 |
| 38 | January 8 | @ San Francisco Warriors | 124–96 | San Francisco Civic Auditorium | 27–11 |
| 39 | January 12 | Los Angeles Lakers | 114–102 | Boston Garden | 28–11 |
| 40 | January 14 | @ Philadelphia 76ers | 100–112 | Convention Hall | 28–12 |
| 41 | January 16 | Philadelphia 76ers | 137–122 | Boston Garden | 29–12 |