| month | day | visitor | score | home | score |
|---|
| November | 2, 2004 | Cavaliers | | Celtics | |
| November | 3, 2004 | Celtics | | Blazers | |
| November | 4, 2004 | Hawks | | Celtics | |
| November | 7, 2004 | Pistons | | Celtics | |
| November | 11, 2004 | Celtics | | Heat | |
| November | 16, 2004 | 76ers | | Celtics | |
| November | 18, 2004 | Bulls | | Celtics | |
| November | 21, 2004 | Knicks | | Celtics | |
| November | 22, 2004 | Celtics | | Warriors | |
| November | 25, 2004 | Celtics | | Nuggets | |
| November | 26, 2004 | Pistons | | Celtics | |
| November | 27, 2004 | Blazers | | Celtics | |
| November | 28, 2004 | Celtics | | Knicks | |
| December | 1, 2004 | Celtics | | Grizzlies | |
| December | 8, 2004 | Celtics | | Bucks | |
| December | 9, 2004 | Celtics | | Bucks | |
| December | 12, 2004 | Magic | | Celtics | |
| December | 13, 2004 | Celtics | | Wizards | |
| December | 16, 2004 | Celtics | | 76ers | |
| December | 17, 2004 | Hornets | | Celtics | |
| December | 21, 2004 | 76ers | | Celtics | |
| December | 23, 2004 | Celtics | | Knicks | |
| December | 30, 2004 | Kings | | Celtics | |
| January | 1, 2005 | Celtics | | 76ers | |
| January | 2, 2005 | Raptors | | Celtics | |
| January | 5, 2005 | Nuggets | | Celtics | |
| January | 6, 2005 | Wizards | | Celtics | |
| January | 7, 2005 | Celtics | | Suns | |
| January | 8, 2005 | Suns | | Celtics | |
| January | 11, 2005 | Mavericks | | Celtics | |
| January | 21, 2005 | Celtics | | Magic | |
| January | 24, 2005 | Spurs | | Celtics | |
| January | 25, 2005 | Celtics | | Hornets | |
| January | 26, 2005 | Celtics | | Wolves | |
| January | 27, 2005 | Clippers | | Celtics | |
| January | 28, 2005 | Celtics | | Nets | |
| January | 30, 2005 | Celtics | | Bulls | |
| January | 31, 2005 | Heat | | Celtics | |
| February | 1, 2005 | Celtics | | Kings | |
| February | 2, 2005 | Celtics | | Heat | |
| February | 5, 2005 | Jazz | | Celtics | |
| February | 8, 2005 | Heat | | Celtics | |
| February | 9, 2005 | Celtics | | Nets | |
| February | 13, 2005 | Pacers | | Celtics | |
| February | 17, 2005 | Bobcats | | Celtics | |
| February | 18, 2005 | 76ers | | Celtics | |
| February | 19, 2005 | Rockets | | Celtics | |
| February | 20, 2005 | Grizzlies | | Celtics | |
| February | 22, 2005 | Celtics | | Knicks | |
| February | 23, 2005 | Celtics | | Magic | |
| February | 24, 2005 | Bobcats | | Celtics | |
| February | 25, 2005 | Celtics | | Jazz | |
| February | 28, 2005 | Celtics | | Wizards | |
| March | 2, 2005 | Wolves | | Celtics | |
| March | 5, 2005 | Magic | | Celtics | |
| March | 11, 2005 | Celtics | | Lakers | |
| March | 12, 2005 | Celtics | | Spurs | |
| March | 13, 2005 | Celtics | | Hawks | |
| March | 14, 2005 | Celtics | | Heat | |
| March | 16, 2005 | Knicks | | Celtics | |
| March | 17, 2005 | Celtics | | Rockets | |
| March | 19, 2005 | Lakers | | Celtics | |
| March | 20, 2005 | Nets | | Celtics | |
| March | 21, 2005 | Sonics | | Celtics | |
| March | 22, 2005 | Celtics | | Mavericks | |
| March | 28, 2005 | Celtics | | Magic | |
| April | 2, 2005 | Celtics | | Cavaliers | |
| April | 3, 2005 | Celtics | | Raptors | |
| April | 4, 2005 | Celtics | | Wizards | |
| April | 5, 2005 | Pacers | | Celtics | |
| April | 6, 2005 | Wizards | | Celtics | |
| April | 7, 2005 | Celtics | | Nets | |
| April | 9, 2005 | Hawks | | Celtics | |
| April | 11, 2005 | Celtics | | Sonics | |
| April | 13, 2005 | Celtics | | Bulls | |
| April | 15, 2005 | Celtics | | Clippers | |
| April | 16, 2005 | Warriors | | Celtics | |
| April | 18, 2005 | Celtics | | Bobcats | |
| April | 25, 2005 | Bucks | | Celtics | |
| April | 28, 2005 | Nets | | Celtics | |
| April | 29, 2005 | Celtics | | Pistons | |
| April | 30, 2005 | Celtics | | Pacers | |
| May | 3, 2005 | Raptors | | Celtics | |
| May | 4, 2005 | Cavaliers | | Celtics | |