| month | day | visitor | score | home | score |
|---|
| November | 3, 2027 | Celtics | 91 | Warriors | 88 |
| November | 4, 2027 | Celtics | 81 | Nets | 102 |
| November | 5, 2027 | Celtics | 106 | Nets | 117 |
| November | 7, 2027 | Bulls | 101 | Celtics | 96 |
| November | 10, 2027 | Wolves | 115 | Celtics | 101 |
| November | 13, 2027 | Celtics | 97 | Nets | 104 |
| November | 14, 2027 | Jazz | 94 | Celtics | 90 |
| November | 15, 2027 | Celtics | 82 | Jazz | 114 |
| November | 18, 2027 | 76ers | 98 | Celtics | 91 |
| November | 19, 2027 | Grizzlies | 94 | Celtics | 79 |
| November | 21, 2027 | Celtics | 113 | Bucks | 101 |
| November | 22, 2027 | Pacers | 107 | Celtics | 112 |
| November | 23, 2027 | Celtics | 85 | Pacers | 89 |
| November | 24, 2027 | Celtics | 83 | Sonics | 107 |
| November | 28, 2027 | Raptors | 109 | Celtics | 99 |
| November | 30, 2027 | Lakers | 96 | Celtics | 111 |
| December | 2, 2027 | Celtics | 80 | Pacers | 97 |
| December | 3, 2027 | Raptors | 103 | Celtics | 94 |
| December | 5, 2027 | Celtics | 93 | Knicks | 106 |
| December | 7, 2027 | Raptors | 103 | Celtics | 104 |
| December | 8, 2027 | Celtics | 85 | Bulls | 98 |
| December | 9, 2027 | Celtics | 93 | Knicks | 92 |
| December | 10, 2027 | Celtics | 80 | Rockets | 99 |
| December | 12, 2027 | Celtics | 84 | 76ers | 102 |
| December | 14, 2027 | Celtics | 93 | Grizzlies | 114 |
| December | 16, 2027 | Clippers | 98 | Celtics | 116 |
| December | 18, 2027 | Celtics | 82 | Bucks | 123 |
| December | 19, 2027 | Celtics | 96 | Bulls | 94 |
| December | 24, 2027 | Celtics | 85 | Heat | 104 |
| December | 25, 2027 | Celtics | 90 | Heat | 122 |
| December | 27, 2027 | Celtics | 90 | Suns | 86 |
| January | 1, 2028 | Pacers | 104 | Celtics | 101 |
| January | 2, 2028 | 76ers | 108 | Celtics | 88 |
| January | 3, 2028 | Heat | 104 | Celtics | 110 |
| January | 5, 2028 | Celtics | 89 | Bucks | 102 |
| January | 7, 2028 | Suns | 110 | Celtics | 114 |
| January | 8, 2028 | Pacers | 97 | Celtics | 95 |
| January | 12, 2028 | Celtics | 106 | Grizzlies | 110 |
| January | 13, 2028 | Pelicans | 103 | Celtics | 105 |
| January | 15, 2028 | Celtics | 88 | Raptors | 108 |
| January | 16, 2028 | Rockets | 116 | Celtics | 115 |
| January | 20, 2028 | 76ers | 86 | Celtics | 95 |
| January | 21, 2028 | Kings | 97 | Celtics | 93 |
| January | 27, 2028 | Grizzlies | 126 | Celtics | 88 |
| January | 28, 2028 | Nuggets | 107 | Celtics | 80 |
| January | 31, 2028 | Pacers | 104 | Celtics | 112 |
| February | 4, 2028 | Celtics | 87 | Pelicans | 102 |
| February | 7, 2028 | Celtics | 79 | Grizzlies | 121 |
| February | 10, 2028 | Warriors | 88 | Celtics | 97 |
| February | 12, 2028 | Celtics | 104 | Kings | 112 |
| February | 19, 2028 | Celtics | 89 | Knicks | 112 |
| February | 21, 2028 | Raptors | 98 | Celtics | 94 |
| February | 22, 2028 | Celtics | 98 | Raptors | 109 |
| February | 26, 2028 | Spurs | 109 | Celtics | 114 |
| February | 27, 2028 | Celtics | 94 | Pacers | 105 |
| March | 2, 2028 | Nets | 113 | Celtics | 101 |
| March | 10, 2028 | Bucks | 104 | Celtics | 100 |
| March | 16, 2028 | Celtics | 87 | Bulls | 103 |
| March | 18, 2028 | Celtics | 96 | Heat | 128 |
| March | 19, 2028 | Sonics | 92 | Celtics | 110 |
| March | 21, 2028 | Celtics | 84 | Raptors | 109 |
| March | 22, 2028 | Celtics | 93 | Pelicans | 116 |
| March | 25, 2028 | Celtics | 74 | Lakers | 115 |
| March | 28, 2028 | Celtics | 113 | Mavericks | 103 |
| April | 3, 2028 | Celtics | 91 | Bucks | 115 |
| April | 8, 2028 | Bulls | 97 | Celtics | 99 |
| April | 9, 2028 | Grizzlies | 113 | Celtics | 100 |
| April | 11, 2028 | Celtics | 103 | Nuggets | 106 |
| April | 14, 2028 | Celtics | 94 | Pelicans | 88 |
| April | 16, 2028 | Bucks | 124 | Celtics | 108 |
| April | 19, 2028 | Knicks | 104 | Celtics | 126 |
| April | 20, 2028 | Bucks | 122 | Celtics | 102 |
| April | 26, 2028 | Celtics | 100 | Clippers | 120 |
| May | 2, 2028 | Celtics | 80 | Spurs | 97 |
| May | 5, 2028 | Celtics | 77 | Wolves | 92 |
| May | 6, 2028 | Bulls | 102 | Celtics | 105 |
| May | 8, 2028 | Bulls | 108 | Celtics | 99 |
| May | 9, 2028 | Mavericks | 104 | Celtics | 117 |
| May | 10, 2028 | Nets | 96 | Celtics | 98 |
| May | 11, 2028 | Pelicans | 100 | Celtics | 124 |
| May | 13, 2028 | Bulls | 127 | Celtics | 117 |
| May | 14, 2028 | Grizzlies | 125 | Celtics | 118 |