| month | day | visitor | score | home | score |
|---|
| November | 3, 2027 | Celtics | 69 | Warriors | 97 |
| November | 4, 2027 | Celtics | 83 | Nets | 101 |
| November | 5, 2027 | Celtics | 98 | Nets | 111 |
| November | 7, 2027 | Bulls | 105 | Celtics | 107 |
| November | 10, 2027 | Wolves | 99 | Celtics | 104 |
| November | 13, 2027 | Celtics | 90 | Nets | 105 |
| November | 14, 2027 | Jazz | 95 | Celtics | 91 |
| November | 15, 2027 | Celtics | 85 | Jazz | 97 |
| November | 18, 2027 | 76ers | 85 | Celtics | 92 |
| November | 19, 2027 | Grizzlies | 113 | Celtics | 93 |
| November | 21, 2027 | Celtics | 92 | Bucks | 108 |
| November | 22, 2027 | Pacers | 93 | Celtics | 87 |
| November | 23, 2027 | Celtics | 81 | Pacers | 94 |
| November | 24, 2027 | Celtics | 95 | Sonics | 83 |
| November | 28, 2027 | Raptors | 114 | Celtics | 88 |
| November | 30, 2027 | Lakers | 92 | Celtics | 101 |
| December | 2, 2027 | Celtics | 86 | Pacers | 113 |
| December | 3, 2027 | Raptors | 116 | Celtics | 97 |
| December | 5, 2027 | Celtics | 97 | Knicks | 103 |
| December | 7, 2027 | Raptors | 108 | Celtics | 82 |
| December | 8, 2027 | Celtics | 82 | Bulls | 84 |
| December | 9, 2027 | Celtics | 104 | Knicks | 114 |
| December | 10, 2027 | Celtics | 92 | Rockets | 110 |
| December | 12, 2027 | Celtics | 87 | 76ers | 72 |
| December | 14, 2027 | Celtics | 102 | Grizzlies | 106 |
| December | 16, 2027 | Clippers | 108 | Celtics | 95 |
| December | 18, 2027 | Celtics | 123 | Bucks | 95 |
| December | 19, 2027 | Celtics | 117 | Bulls | 98 |
| December | 24, 2027 | Celtics | 92 | Heat | 105 |
| December | 25, 2027 | Celtics | 95 | Heat | 121 |
| December | 27, 2027 | Celtics | 100 | Suns | 84 |
| January | 1, 2028 | Pacers | 86 | Celtics | 105 |
| January | 2, 2028 | 76ers | 69 | Celtics | 97 |
| January | 3, 2028 | Heat | 102 | Celtics | 104 |
| January | 5, 2028 | Celtics | 93 | Bucks | 120 |
| January | 7, 2028 | Suns | 109 | Celtics | 106 |
| January | 8, 2028 | Pacers | 104 | Celtics | 95 |
| January | 12, 2028 | Celtics | 92 | Grizzlies | 110 |
| January | 13, 2028 | Pelicans | 98 | Celtics | 100 |
| January | 15, 2028 | Celtics | 94 | Raptors | 109 |
| January | 16, 2028 | Rockets | 93 | Celtics | 109 |
| January | 20, 2028 | 76ers | 102 | Celtics | 85 |
| January | 21, 2028 | Kings | 108 | Celtics | 104 |
| January | 27, 2028 | Grizzlies | 112 | Celtics | 83 |
| January | 28, 2028 | Nuggets | 108 | Celtics | 98 |
| January | 31, 2028 | Pacers | 125 | Celtics | 101 |
| February | 4, 2028 | Celtics | | Pelicans | |
| February | 7, 2028 | Celtics | | Grizzlies | |
| February | 10, 2028 | Warriors | | Celtics | |
| February | 12, 2028 | Celtics | | Kings | |
| February | 19, 2028 | Celtics | | Knicks | |
| February | 21, 2028 | Raptors | | Celtics | |
| February | 22, 2028 | Celtics | | Raptors | |
| February | 26, 2028 | Spurs | | Celtics | |
| February | 27, 2028 | Celtics | | Pacers | |
| March | 2, 2028 | Nets | | Celtics | |
| March | 10, 2028 | Bucks | | Celtics | |
| March | 16, 2028 | Celtics | | Bulls | |
| March | 18, 2028 | Celtics | | Heat | |
| March | 19, 2028 | Sonics | | Celtics | |
| March | 21, 2028 | Celtics | | Raptors | |
| March | 22, 2028 | Celtics | | Pelicans | |
| March | 25, 2028 | Celtics | | Lakers | |
| March | 28, 2028 | Celtics | | Mavericks | |
| April | 3, 2028 | Celtics | | Bucks | |
| April | 8, 2028 | Bulls | | Celtics | |
| April | 9, 2028 | Grizzlies | | Celtics | |
| April | 11, 2028 | Celtics | | Nuggets | |
| April | 14, 2028 | Celtics | | Pelicans | |
| April | 16, 2028 | Bucks | | Celtics | |
| April | 19, 2028 | Knicks | | Celtics | |
| April | 20, 2028 | Bucks | | Celtics | |
| April | 26, 2028 | Celtics | | Clippers | |
| May | 2, 2028 | Celtics | | Spurs | |
| May | 5, 2028 | Celtics | | Wolves | |
| May | 6, 2028 | Bulls | | Celtics | |
| May | 8, 2028 | Bulls | | Celtics | |
| May | 9, 2028 | Mavericks | | Celtics | |
| May | 10, 2028 | Nets | | Celtics | |
| May | 11, 2028 | Pelicans | | Celtics | |
| May | 13, 2028 | Bulls | | Celtics | |
| May | 14, 2028 | Grizzlies | | Celtics | |