| month | day | visitor | score | home | score |
|---|
| November | 2, 2020 | Celtics | 88 | Knicks | 100 |
| November | 5, 2020 | 76ers | 78 | Celtics | 91 |
| November | 6, 2020 | Celtics | 113 | Raptors | 120 |
| November | 7, 2020 | Celtics | 86 | Heat | 82 |
| November | 10, 2020 | Celtics | 93 | Nets | 92 |
| November | 13, 2020 | Grizzlies | 84 | Celtics | 120 |
| November | 14, 2020 | Raptors | 111 | Celtics | 107 |
| November | 18, 2020 | Rockets | 98 | Celtics | 120 |
| November | 22, 2020 | Kings | 103 | Celtics | 85 |
| November | 23, 2020 | Celtics | 95 | 76ers | 74 |
| November | 24, 2020 | Raptors | 147 | Celtics | 125 |
| November | 25, 2020 | Bulls | 102 | Celtics | 97 |
| November | 26, 2020 | Grizzlies | 84 | Celtics | 108 |
| November | 28, 2020 | Mavericks | 82 | Celtics | 91 |
| November | 29, 2020 | Bucks | 106 | Celtics | 117 |
| November | 30, 2020 | Celtics | 98 | Nets | 99 |
| December | 1, 2020 | Nets | 95 | Celtics | 101 |
| December | 8, 2020 | Celtics | 93 | Pelicans | 119 |
| December | 9, 2020 | Jazz | 100 | Celtics | 110 |
| December | 12, 2020 | Suns | 86 | Celtics | 131 |
| December | 13, 2020 | Nuggets | 97 | Celtics | 129 |
| December | 15, 2020 | Spurs | 94 | Celtics | 119 |
| December | 17, 2020 | Celtics | 123 | Bulls | 97 |
| December | 24, 2020 | Pelicans | 109 | Celtics | 144 |
| December | 26, 2020 | 76ers | 107 | Celtics | 128 |
| December | 28, 2020 | Knicks | 104 | Celtics | 97 |
| December | 31, 2020 | Lakers | 109 | Celtics | 115 |
| January | 1, 2021 | Grizzlies | 98 | Celtics | 121 |
| January | 2, 2021 | Celtics | 121 | Grizzlies | 103 |
| January | 4, 2021 | Wolves | 105 | Celtics | 116 |
| January | 5, 2021 | Pelicans | 146 | Celtics | 127 |
| January | 6, 2021 | 76ers | 82 | Celtics | 101 |
| January | 8, 2021 | Knicks | 104 | Celtics | 114 |
| January | 10, 2021 | Celtics | 96 | Heat | 92 |
| January | 22, 2021 | Celtics | 107 | 76ers | 101 |
| January | 24, 2021 | Celtics | 120 | Hawks | 104 |
| January | 27, 2021 | Celtics | 114 | Sonics | 91 |
| January | 28, 2021 | Celtics | 107 | Pacers | 80 |
| January | 30, 2021 | Celtics | 122 | Wolves | 92 |
| January | 31, 2021 | Celtics | 103 | Hawks | 123 |
| February | 2, 2021 | Heat | 86 | Celtics | 108 |
| February | 13, 2021 | Celtics | 121 | Pelicans | 100 |
| February | 17, 2021 | Celtics | 114 | Warriors | 103 |
| February | 19, 2021 | Celtics | 117 | Raptors | 128 |
| February | 21, 2021 | Celtics | 114 | Jazz | 103 |
| February | 22, 2021 | Nets | 127 | Celtics | 110 |
| February | 23, 2021 | Celtics | 130 | Blazers | 119 |
| February | 24, 2021 | Celtics | 130 | Pelicans | 132 |
| February | 25, 2021 | Celtics | 109 | Lakers | 119 |
| February | 26, 2021 | Clippers | 112 | Celtics | 126 |
| March | 1, 2021 | Bulls | 108 | Celtics | 137 |
| March | 2, 2021 | Hawks | 90 | Celtics | 130 |
| March | 3, 2021 | Warriors | 118 | Celtics | 126 |
| March | 4, 2021 | Celtics | 118 | Knicks | 99 |
| March | 7, 2021 | 76ers | 95 | Celtics | 111 |
| March | 9, 2021 | Celtics | 124 | Bulls | 89 |
| March | 10, 2021 | Bulls | 109 | Celtics | 117 |
| March | 12, 2021 | Bucks | 96 | Celtics | 129 |
| March | 16, 2021 | Pacers | 75 | Celtics | 132 |
| March | 17, 2021 | Celtics | 114 | Knicks | 106 |
| March | 18, 2021 | Celtics | 126 | Knicks | 113 |
| March | 19, 2021 | Heat | 89 | Celtics | 87 |
| March | 20, 2021 | Nets | 106 | Celtics | 101 |
| March | 21, 2021 | Celtics | 135 | Spurs | 112 |
| March | 22, 2021 | Celtics | 94 | Nuggets | 108 |
| March | 23, 2021 | Celtics | 116 | Suns | 113 |
| March | 25, 2021 | Celtics | 109 | Pacers | 133 |
| March | 26, 2021 | Pelicans | 124 | Celtics | 148 |
| March | 28, 2021 | Hawks | 101 | Celtics | 123 |
| March | 29, 2021 | Celtics | 92 | Kings | 106 |
| March | 30, 2021 | Celtics | 104 | Bucks | 116 |
| April | 6, 2021 | Sonics | 103 | Celtics | 107 |
| April | 7, 2021 | Celtics | 98 | Clippers | 132 |
| April | 10, 2021 | Celtics | 106 | Heat | 73 |
| April | 14, 2021 | Blazers | 131 | Celtics | 127 |
| April | 15, 2021 | Celtics | 104 | Bucks | 123 |
| April | 16, 2021 | Pacers | 118 | Celtics | 108 |
| April | 18, 2021 | Celtics | 92 | Heat | 90 |
| April | 20, 2021 | Celtics | 88 | Nets | 134 |
| April | 24, 2021 | Celtics | 103 | Mavericks | 87 |
| April | 25, 2021 | Celtics | 102 | Grizzlies | 86 |
| April | 26, 2021 | Celtics | 109 | Rockets | 112 |
| Post | 1, 2021 | Knicks | 104 | Celtics | 92 |
| Post | 2, 2021 | Knicks | 85 | Celtics | 89 |
| Post | 3, 2021 | Celtics | 100 | Knicks | 92 |
| Post | 4, 2021 | Celtics | 78 | Knicks | 112 |
| Post | 5, 2021 | Knicks | 97 | Celtics | 114 |
| Post | 6, 2021 | Celtics | 117 | Knicks | 105 |
| Post | 7, 2021 | Knicks | | Celtics | |
| Post | 8, 2021 | Celtics | 117 | Pelicans | 139 |
| Post | 9, 2021 | Celtics | 141 | Pelicans | 132 |
| Post | 10, 2021 | Pelicans | 125 | Celtics | 132 |
| Post | 11, 2021 | Pelicans | 125 | Celtics | 109 |
| Post | 12, 2021 | Celtics | 127 | Pelicans | 114 |
| Post | 13, 2021 | Pelicans | 116 | Celtics | 115 |
| Post | 14, 2021 | Celtics | 122 | Pelicans | 138 |