| month | day | visitor | score | home | score |
|---|
| November | 5, 2009 | Magic | 85 | Celtics | 96 |
| November | 6, 2009 | Mavericks | 78 | Celtics | 91 |
| November | 7, 2009 | Celtics | 88 | Jazz | 105 |
| November | 11, 2009 | Celtics | 108 | Rockets | 118 |
| November | 12, 2009 | Celtics | 108 | 76ers | 100 |
| November | 13, 2009 | Rockets | 94 | Celtics | 83 |
| November | 15, 2009 | Nuggets | 81 | Celtics | 85 |
| November | 23, 2009 | Spurs | 78 | Celtics | 110 |
| November | 26, 2009 | Pistons | 60 | Celtics | 103 |
| November | 30, 2009 | Celtics | 102 | Pacers | 113 |
| December | 3, 2009 | Celtics | 79 | Heat | 103 |
| December | 4, 2009 | Celtics | 85 | Wizards | 84 |
| December | 5, 2009 | Cavaliers | 86 | Celtics | 98 |
| December | 6, 2009 | Celtics | 119 | Pacers | 123 |
| December | 7, 2009 | Celtics | 92 | Kings | 85 |
| December | 8, 2009 | Bucks | 76 | Celtics | 97 |
| December | 9, 2009 | Celtics | 97 | Blazers | 92 |
| December | 10, 2009 | Celtics | 105 | Wizards | 101 |
| December | 12, 2009 | Celtics | 104 | Knicks | 90 |
| December | 16, 2009 | Pistons | 101 | Celtics | 123 |
| December | 17, 2009 | Celtics | 97 | Knicks | 81 |
| December | 18, 2009 | Celtics | 89 | Suns | 84 |
| December | 21, 2009 | Celtics | 108 | Magic | 105 |
| December | 24, 2009 | Celtics | 106 | Raptors | 95 |
| December | 26, 2009 | Celtics | 108 | Clippers | 80 |
| December | 29, 2009 | Knicks | 73 | Celtics | 110 |
| December | 30, 2009 | Celtics | 77 | Bucks | 83 |
| January | 3, 2010 | Wizards | 110 | Celtics | 125 |
| January | 7, 2010 | Cavaliers | 68 | Celtics | 119 |
| January | 8, 2010 | Heat | 94 | Celtics | 114 |
| January | 11, 2010 | Bulls | 97 | Celtics | 117 |
| January | 12, 2010 | Celtics | 99 | Mavericks | 87 |
| January | 14, 2010 | Bulls | 107 | Celtics | 126 |
| January | 16, 2010 | Pacers | 104 | Celtics | 138 |
| January | 17, 2010 | Celtics | 91 | Hawks | 89 |
| January | 20, 2010 | Jazz | 88 | Celtics | 122 |
| January | 22, 2010 | Nets | 77 | Celtics | 99 |
| January | 23, 2010 | Kings | 94 | Celtics | 98 |
| January | 24, 2010 | Magic | 106 | Celtics | 116 |
| January | 25, 2010 | Celtics | 92 | Nets | 76 |
| January | 28, 2010 | Celtics | 110 | Hawks | 107 |
| January | 29, 2010 | Bucks | 80 | Celtics | 70 |
| January | 30, 2010 | Celtics | 102 | Pistons | 76 |
| February | 1, 2010 | 76ers | 89 | Celtics | 111 |
| February | 12, 2010 | Celtics | 93 | Cavaliers | 66 |
| February | 13, 2010 | Celtics | 111 | Hornets | 64 |
| February | 15, 2010 | 76ers | 97 | Celtics | 92 |
| February | 16, 2010 | Celtics | 84 | Bucks | 91 |
| February | 17, 2010 | Celtics | 96 | Bulls | 101 |
| February | 19, 2010 | Raptors | 76 | Celtics | 95 |
| February | 20, 2010 | Thunder | 88 | Celtics | 111 |
| February | 22, 2010 | Blazers | 101 | Celtics | 116 |
| February | 24, 2010 | Clippers | 84 | Celtics | 99 |
| February | 26, 2010 | Pacers | 88 | Celtics | 111 |
| February | 27, 2010 | Bobcats | 78 | Celtics | 94 |
| March | 1, 2010 | Celtics | 127 | Cavaliers | 120 |
| March | 2, 2010 | Suns | 94 | Celtics | 95 |
| March | 4, 2010 | Celtics | 84 | Lakers | 82 |
| March | 6, 2010 | Celtics | 104 | Magic | 101 |
| March | 7, 2010 | Hawks | 118 | Celtics | 105 |
| March | 10, 2010 | Celtics | 96 | Heat | 93 |
| March | 12, 2010 | Hawks | 94 | Celtics | 93 |
| March | 16, 2010 | Lakers | 102 | Celtics | 111 |
| March | 17, 2010 | Celtics | 94 | Bulls | 105 |
| March | 19, 2010 | Celtics | 87 | Warriors | 97 |
| March | 20, 2010 | Wizards | 104 | Celtics | 82 |
| March | 21, 2010 | Celtics | 127 | Pistons | 101 |
| March | 22, 2010 | Celtics | 133 | Nuggets | 125 |
| March | 23, 2010 | Wolves | 112 | Celtics | 108 |
| March | 26, 2010 | Celtics | 105 | Raptors | 122 |
| March | 28, 2010 | Celtics | 100 | Grizzlies | 83 |
| April | 3, 2010 | Celtics | 123 | Wolves | 96 |
| April | 5, 2010 | Celtics | 77 | Nets | 102 |
| April | 7, 2010 | Celtics | 95 | Spurs | 105 |
| April | 8, 2010 | Bobcats | 84 | Celtics | 114 |
| April | 10, 2010 | Celtics | 106 | Thunder | 123 |
| April | 11, 2010 | Raptors | 111 | Celtics | 84 |
| April | 12, 2010 | Warriors | 82 | Celtics | 86 |
| April | 17, 2010 | Grizzlies | 81 | Celtics | 107 |
| April | 24, 2010 | Hornets | 85 | Celtics | 104 |
| April | 30, 2010 | Nets | 62 | Celtics | 82 |
| May | 3, 2010 | Celtics | 93 | Bobcats | 98 |
| Post | 1, 2010 | Cavaliers | 110 | Celtics | 115 |
| Post | 2, 2010 | Cavaliers | 74 | Celtics | 104 |
| Post | 3, 2010 | Celtics | 115 | Cavaliers | 90 |
| Post | 4, 2010 | Celtics | 90 | Cavaliers | 105 |
| Post | 5, 2010 | Cavaliers | 112 | Celtics | 119 |
| Post | 6, 2010 | Celtics | | Cavaliers | |
| Post | 7, 2010 | Cavaliers | | Celtics | |
| Post | 8, 2010 | Raptors | 86 | Celtics | 89 |
| Post | 9, 2010 | Raptors | 87 | Celtics | 89 |
| Post | 10, 2010 | Celtics | 94 | Raptors | 90 |
| Post | 11, 2010 | Celtics | 116 | Raptors | 91 |
| Post | 12, 2010 | Raptors | | Celtics | |
| Post | 13, 2010 | Celtics | | Raptors | |
| Post | 14, 2010 | Raptors | | Celtics | |
| Post | 15, 2010 | Bulls | 109 | Celtics | 98 |
| Post | 16, 2010 | Bulls | 97 | Celtics | 109 |
| Post | 17, 2010 | Celtics | 89 | Bulls | 75 |
| Post | 18, 2010 | Celtics | 102 | Bulls | 113 |
| Post | 19, 2010 | Bulls | 101 | Celtics | 108 |
| Post | 20, 2010 | Celtics | 121 | Bulls | 89 |
| Post | 21, 2010 | Bulls | | Celtics | |
| Post | 22, 2010 | Suns | 94 | Celtics | 89 |
| Post | 23, 2010 | Suns | 80 | Celtics | 104 |
| Post | 24, 2010 | Celtics | 91 | Suns | 96 |
| Post | 25, 2010 | Celtics | 100 | Suns | 117 |
| Post | 26, 2010 | Celtics | 93 | Suns | 88 |
| Post | 27, 2010 | Suns | 87 | Celtics | 101 |
| Post | 28, 2010 | Suns | 81 | Celtics | 107 |