| month | day | visitor | score | home | score |
|---|
| November | 2, 2026 | Mavericks | 98 | Celtics | 111 |
| November | 3, 2026 | Nets | 92 | Celtics | 108 |
| November | 5, 2026 | Celtics | 113 | Pistons | 114 |
| November | 9, 2026 | 76ers | | Celtics | |
| November | 10, 2026 | Celtics | | Bulls | |
| November | 11, 2026 | Celtics | | Bucks | |
| November | 13, 2026 | Raptors | | Celtics | |
| November | 14, 2026 | Nuggets | | Celtics | |
| November | 15, 2026 | Hawks | | Celtics | |
| November | 19, 2026 | Celtics | | Suns | |
| November | 22, 2026 | Celtics | | Nets | |
| November | 25, 2026 | Celtics | | Heat | |
| November | 29, 2026 | 76ers | | Celtics | |
| December | 1, 2026 | 76ers | | Celtics | |
| December | 3, 2026 | Lakers | | Celtics | |
| December | 7, 2026 | Thunder | | Celtics | |
| December | 10, 2026 | Celtics | | Heat | |
| December | 12, 2026 | Celtics | | Heat | |
| December | 13, 2026 | Hornets | | Celtics | |
| December | 14, 2026 | Kings | | Celtics | |
| December | 15, 2026 | Celtics | | Bulls | |
| December | 16, 2026 | Celtics | | Wolves | |
| December | 18, 2026 | Celtics | | Raptors | |
| December | 19, 2026 | Celtics | | Hornets | |
| December | 22, 2026 | Celtics | | Clippers | |
| December | 25, 2026 | Celtics | | Warriors | |
| December | 27, 2026 | Spurs | | Celtics | |
| December | 29, 2026 | Celtics | | Knicks | |
| January | 1, 2027 | Pacers | | Celtics | |
| January | 2, 2027 | Jazz | | Celtics | |
| January | 3, 2027 | Pistons | | Celtics | |
| January | 5, 2027 | Celtics | | Knicks | |
| January | 7, 2027 | Hornets | | Celtics | |
| January | 8, 2027 | Pistons | | Celtics | |
| January | 12, 2027 | Celtics | | Magic | |
| January | 16, 2027 | Knicks | | Celtics | |
| January | 20, 2027 | Celtics | | Magic | |
| January | 24, 2027 | Suns | | Celtics | |
| January | 28, 2027 | Celtics | | Magic | |
| February | 1, 2027 | Clippers | | Celtics | |
| February | 5, 2027 | Celtics | | 76ers | |
| February | 7, 2027 | Celtics | | Nets | |
| February | 14, 2027 | Celtics | | Kings | |
| February | 16, 2027 | Celtics | | Lakers | |
| February | 20, 2027 | Heat | | Celtics | |
| February | 24, 2027 | Bulls | | Celtics | |
| February | 25, 2027 | Pacers | | Celtics | |
| March | 3, 2027 | Celtics | | Spurs | |
| March | 5, 2027 | Blazers | | Celtics | |
| March | 6, 2027 | Celtics | | Blazers | |
| March | 9, 2027 | Cavaliers | | Celtics | |
| March | 11, 2027 | Celtics | | Thunder | |
| March | 12, 2027 | Warriors | | Celtics | |
| March | 13, 2027 | Hawks | | Celtics | |
| March | 17, 2027 | Celtics | | Jazz | |
| March | 18, 2027 | Wizards | | Celtics | |
| March | 19, 2027 | Celtics | | 76ers | |
| March | 21, 2027 | Celtics | | Rockets | |
| March | 22, 2027 | Celtics | | Wizards | |
| March | 23, 2027 | Bucks | | Celtics | |
| March | 24, 2027 | Celtics | | Grizzlies | |
| March | 26, 2027 | Celtics | | Knicks | |
| March | 27, 2027 | Rockets | | Celtics | |
| March | 30, 2027 | Raptors | | Celtics | |
| April | 1, 2027 | Celtics | | Pacers | |
| April | 4, 2027 | Magic | | Celtics | |
| April | 7, 2027 | Celtics | | Nuggets | |
| April | 11, 2027 | Cavaliers | | Celtics | |
| April | 12, 2027 | Grizzlies | | Celtics | |
| April | 13, 2027 | Pelicans | | Celtics | |
| April | 14, 2027 | Celtics | | Nets | |
| April | 16, 2027 | Nets | | Celtics | |
| April | 17, 2027 | Heat | | Celtics | |
| April | 20, 2027 | Magic | | Celtics | |
| April | 21, 2027 | Celtics | | Wizards | |
| April | 22, 2027 | Celtics | | Pelicans | |
| April | 24, 2027 | Celtics | | Cavaliers | |
| April | 27, 2027 | Wolves | | Celtics | |
| April | 28, 2027 | Celtics | | Bucks | |
| April | 30, 2027 | Celtics | | Wizards | |
| May | 1, 2027 | Wizards | | Celtics | |
| May | 4, 2027 | Celtics | | Hawks | |
| May | 5, 2027 | Celtics | | Mavericks | |
| May | 6, 2027 | Knicks | | Celtics | |