| month | day | visitor | score | home | score |
|---|
| November | 3, 2005 | Celtics | 87 | Grizzlies | 96 |
| November | 5, 2005 | Celtics | 119 | 76ers | 116 |
| November | 6, 2005 | Celtics | 88 | Pacers | 115 |
| November | 8, 2005 | Pistons | 100 | Celtics | 103 |
| November | 15, 2005 | 76ers | 117 | Celtics | 106 |
| November | 16, 2005 | Celtics | 84 | Spurs | 86 |
| November | 20, 2005 | Pistons | 88 | Celtics | 101 |
| November | 21, 2005 | Rockets | 75 | Celtics | 102 |
| November | 22, 2005 | Cavaliers | 99 | Celtics | 125 |
| November | 28, 2005 | Raptors | 111 | Celtics | 116 |
| November | 29, 2005 | Celtics | 116 | Nuggets | 104 |
| December | 4, 2005 | Celtics | 109 | Knicks | 101 |
| December | 5, 2005 | Celtics | 112 | Lakers | 105 |
| December | 7, 2005 | Blazers | 95 | Celtics | 102 |
| December | 8, 2005 | Heat | 79 | Celtics | 111 |
| December | 9, 2005 | Celtics | 85 | Mavericks | 93 |
| December | 10, 2005 | Celtics | 98 | Bucks | 92 |
| December | 16, 2005 | Hornets | 100 | Celtics | 102 |
| December | 19, 2005 | Celtics | 88 | Magic | 107 |
| December | 21, 2005 | Celtics | 100 | Hornets | 92 |
| December | 24, 2005 | Celtics | 102 | Clippers | 104 |
| January | 2, 2006 | Clippers | | Celtics | |
| January | 3, 2006 | Raptors | | Celtics | |
| January | 4, 2006 | 76ers | | Celtics | |
| January | 7, 2006 | Celtics | | Knicks | |
| January | 9, 2006 | Heat | | Celtics | |
| January | 10, 2006 | Hawks | | Celtics | |
| January | 11, 2006 | Celtics | | Nets | |
| January | 15, 2006 | Jazz | | Celtics | |
| January | 17, 2006 | Bullets | | Celtics | |
| January | 18, 2006 | Celtics | | 76ers | |
| January | 20, 2006 | Celtics | | Sonics | |
| January | 21, 2006 | Celtics | | Heat | |
| January | 23, 2006 | Celtics | | Warriors | |
| January | 25, 2006 | Celtics | | Suns | |
| January | 30, 2006 | Celtics | | Magic | |
| January | 31, 2006 | Pacers | | Celtics | |
| February | 1, 2006 | Celtics | | Knicks | |
| February | 4, 2006 | Celtics | | Bullets | |
| February | 8, 2006 | Bulls | | Celtics | |
| February | 9, 2006 | Celtics | | Pistons | |
| February | 10, 2006 | Knicks | | Celtics | |
| February | 11, 2006 | Nets | | Celtics | |
| February | 13, 2006 | Kings | | Celtics | |
| February | 17, 2006 | Magic | | Celtics | |
| February | 18, 2006 | Spurs | | Celtics | |
| February | 23, 2006 | Celtics | | Bullets | |
| February | 24, 2006 | Celtics | | Bullets | |
| February | 26, 2006 | Celtics | | Bucks | |
| February | 27, 2006 | Nuggets | | Celtics | |
| March | 1, 2006 | Celtics | | Heat | |
| March | 2, 2006 | 76ers | | Celtics | |
| March | 5, 2006 | Bullets | | Celtics | |
| March | 6, 2006 | Celtics | | Nets | |
| March | 8, 2006 | Celtics | | Nets | |
| March | 9, 2006 | Knicks | | Celtics | |
| March | 11, 2006 | Wolves | | Celtics | |
| March | 12, 2006 | Celtics | | Bulls | |
| March | 13, 2006 | Lakers | | Celtics | |
| March | 14, 2006 | Celtics | | Blazers | |
| March | 15, 2006 | Magic | | Celtics | |
| March | 18, 2006 | Celtics | | Magic | |
| March | 19, 2006 | Celtics | | Bulls | |
| March | 20, 2006 | Celtics | | Heat | |
| March | 22, 2006 | Celtics | | Cavaliers | |
| March | 24, 2006 | Celtics | | Jazz | |
| March | 26, 2006 | Warriors | | Celtics | |
| March | 27, 2006 | Pacers | | Celtics | |
| March | 29, 2006 | Celtics | | Rockets | |
| March | 30, 2006 | Celtics | | Raptors | |
| April | 1, 2006 | Celtics | | Wolves | |
| April | 3, 2006 | Celtics | | Hawks | |
| April | 8, 2006 | Sonics | | Celtics | |
| April | 9, 2006 | Hornets | | Celtics | |
| April | 10, 2006 | Cavaliers | | Celtics | |
| April | 13, 2006 | Grizzlies | | Celtics | |
| April | 16, 2006 | Hawks | | Celtics | |
| April | 17, 2006 | Mavericks | | Celtics | |
| April | 20, 2006 | Bucks | | Celtics | |
| April | 21, 2006 | Celtics | | Kings | |
| April | 22, 2006 | Nets | | Celtics | |
| April | 25, 2006 | Suns | | Celtics | |