| month | day | visitor | score | home | score |
|---|
| November | 2, 2012 | Pistons | 92 | Celtics | 110 |
| November | 4, 2012 | 76ers | 85 | Celtics | 84 |
| November | 6, 2012 | Suns | 99 | Celtics | 119 |
| November | 9, 2012 | Pelicans | 68 | Celtics | 96 |
| November | 10, 2012 | Celtics | 101 | Cavaliers | 73 |
| November | 11, 2012 | Celtics | 82 | 76ers | 113 |
| November | 15, 2012 | Thunder | 109 | Celtics | 96 |
| November | 16, 2012 | Wizards | 84 | Celtics | 102 |
| November | 22, 2012 | Celtics | 108 | SuperSonics | 104 |
| November | 24, 2012 | Celtics | 116 | Knicks | 100 |
| November | 29, 2012 | Celtics | 89 | Nuggets | 92 |
| November | 30, 2012 | Magic | 88 | Celtics | 90 |
| December | 1, 2012 | Bucks | 94 | Celtics | 100 |
| December | 3, 2012 | Blazers | 97 | Celtics | 92 |
| December | 4, 2012 | Celtics | 90 | Magic | 95 |
| December | 8, 2012 | Nets | 75 | Celtics | 104 |
| December | 9, 2012 | Celtics | 83 | Kings | 102 |
| December | 11, 2012 | Grizzlies | 94 | Celtics | 110 |
| December | 14, 2012 | Celtics | 107 | Thunder | 81 |
| December | 15, 2012 | Celtics | 89 | Mavericks | 99 |
| December | 17, 2012 | Celtics | 86 | Wizards | 90 |
| December | 18, 2012 | Celtics | 101 | Suns | 119 |
| December | 19, 2012 | Celtics | 98 | Timberwolves | 87 |
| December | 21, 2012 | Grizzlies | 81 | Celtics | 99 |
| December | 22, 2012 | Thunder | 96 | Celtics | 119 |
| December | 24, 2012 | Celtics | 97 | Magic | 70 |
| December | 25, 2012 | Celtics | 110 | Blazers | 100 |
| December | 26, 2012 | Celtics | 102 | Bucks | 90 |
| December | 27, 2012 | Celtics | 73 | Nuggets | 80 |
| January | 2, 2013 | Wizards | 62 | Celtics | 107 |
| January | 9, 2013 | Magic | 91 | Celtics | 98 |
| January | 10, 2013 | Suns | 106 | Celtics | 102 |
| January | 11, 2013 | Celtics | 86 | Jazz | 115 |
| January | 14, 2013 | Timberwolves | 95 | Celtics | 104 |
| January | 15, 2013 | SuperSonics | | Celtics | |
| January | 16, 2013 | Wizards | | Celtics | |
| January | 21, 2013 | Celtics | | Heat | |
| January | 23, 2013 | Celtics | | Bulls | |
| January | 26, 2013 | Celtics | | 76ers | |
| January | 29, 2013 | Kings | | Celtics | |
| January | 30, 2013 | Grizzlies | | Celtics | |
| February | 2, 2013 | Celtics | | Grizzlies | |
| February | 5, 2013 | 76ers | | Celtics | |
| February | 6, 2013 | Celtics | | Grizzlies | |
| February | 7, 2013 | Celtics | | Cavaliers | |
| February | 16, 2013 | Celtics | | Pelicans | |
| February | 24, 2013 | Celtics | | Pelicans | |
| February | 26, 2013 | Pacers | | Celtics | |
| February | 27, 2013 | Celtics | | Pacers | |
| February | 28, 2013 | Celtics | | Pistons | |
| March | 2, 2013 | Celtics | | Hornets | |
| March | 3, 2013 | Celtics | | Nets | |
| March | 6, 2013 | Celtics | | Nuggets | |
| March | 8, 2013 | Suns | | Celtics | |
| March | 9, 2013 | Celtics | | Suns | |
| March | 11, 2013 | Celtics | | Lakers | |
| March | 15, 2013 | Raptors | | Celtics | |
| March | 16, 2013 | Celtics | | Raptors | |
| March | 17, 2013 | Mavericks | | Celtics | |
| March | 21, 2013 | Lakers | | Celtics | |
| March | 22, 2013 | Celtics | | Thunder | |
| March | 23, 2013 | 76ers | | Celtics | |
| March | 25, 2013 | Celtics | | Cavaliers | |
| March | 26, 2013 | Jazz | | Celtics | |
| March | 28, 2013 | Magic | | Celtics | |
| March | 29, 2013 | Cavaliers | | Celtics | |
| April | 2, 2013 | Celtics | | Pelicans | |
| April | 3, 2013 | Celtics | | Pistons | |
| April | 5, 2013 | Knicks | | Celtics | |
| April | 6, 2013 | Celtics | | Heat | |
| April | 8, 2013 | Pistons | | Celtics | |
| April | 11, 2013 | Celtics | | Heat | |
| April | 12, 2013 | Bucks | | Celtics | |
| April | 15, 2013 | Pistons | | Celtics | |
| April | 17, 2013 | Nuggets | | Celtics | |
| April | 19, 2013 | Celtics | | Bucks | |
| April | 23, 2013 | Heat | | Celtics | |
| April | 24, 2013 | Thunder | | Celtics | |
| April | 26, 2013 | Celtics | | Wizards | |
| April | 28, 2013 | Hornets | | Celtics | |
| April | 29, 2013 | Bulls | | Celtics | |
| April | 30, 2013 | Bucks | | Celtics | |