| NBA Preseason - Boston Celtics at Cleveland Cavaliers Thu, 10/08/2026 7:00 PM EDT | Thu, 10/08/2026 7:00 PM EDT | Cleveland Cavaliers | Rocket Mortgage FieldHouse | Cleveland | Flat | - |
| NBA Preseason - Philadelphia 76ers at Boston Celtics Sat, 10/10/2026 8:00 PM EDT | Sat, 10/10/2026 8:00 PM EDT | Boston Celtics | TD Garden | Boston | Flat | - |
| NBA Preseason - Charlotte Hornets at Boston Celtics Wed, 10/14/2026 7:30 PM EDT | Wed, 10/14/2026 7:30 PM EDT | Boston Celtics | TD Garden | Boston | Flat | - |
| NBA Preseason - Boston Celtics at Philadelphia 76ers Fri, 10/16/2026 7:00 PM EDT | Fri, 10/16/2026 7:00 PM EDT | Philadelphia 76ers | Wells Fargo Center - PA | Philadelphia | Flat | - |
| Detroit Pistons at Boston Celtics (Opening Night) Tue, 10/20/2026 12:00 AM EDT | Tue, 10/20/2026 12:00 AM EDT | Boston Celtics | TD Garden | Boston | Flat | - |
| Boston Celtics at Detroit Pistons Tue, 10/20/2026 2:00 PM EDT | Tue, 10/20/2026 2:00 PM EDT | Detroit Pistons | Little Caesars Arena | Detroit | Flat | - |
| New York Knicks at Boston Celtics Fri, 10/23/2026 7:00 PM EDT | Fri, 10/23/2026 7:00 PM EDT | Boston Celtics | TD Garden | Boston | Flat | - |
| Chicago Bulls at Boston Celtics Mon, 10/26/2026 7:30 PM EDT | Mon, 10/26/2026 7:30 PM EDT | Boston Celtics | TD Garden | Boston | Flat | - |
| Brooklyn Nets at Boston Celtics Tue, 10/27/2026 7:30 PM EDT | Tue, 10/27/2026 7:30 PM EDT | Boston Celtics | TD Garden | Boston | Flat | - |
| NBA Cup - Chicago Bulls at Boston Celtics Fri, 10/30/2026 7:30 PM EDT | Fri, 10/30/2026 7:30 PM EDT | Boston Celtics | TD Garden | Boston | Flat | - |
| Boston Celtics at Orlando Magic Sun, 11/01/2026 3:30 PM EST | Sun, 11/01/2026 3:30 PM EST | Orlando Magic | Kia Center | Orlando | Flat | - |
| Boston Celtics at Houston Rockets Mon, 11/02/2026 7:30 PM CST | Mon, 11/02/2026 7:30 PM CST | Houston Rockets | Toyota Center - TX | Houston | Flat | - |
| Milwaukee Bucks at Boston Celtics Wed, 11/04/2026 7:30 PM EST | Wed, 11/04/2026 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Emirates NBA Cup - Boston Celtics at Charlotte Hornets Fri, 11/06/2026 7:00 PM EST | Fri, 11/06/2026 7:00 PM EST | Charlotte Hornets | Spectrum Center | Charlotte | Flat | - |
| Boston Celtics at Milwaukee Bucks Sun, 11/08/2026 7:00 PM CST | Sun, 11/08/2026 7:00 PM CST | Milwaukee Bucks | Fiserv Forum | Milwaukee | Flat | - |
| Boston Celtics at Philadelphia 76ers Tue, 11/10/2026 8:00 PM EST | Tue, 11/10/2026 8:00 PM EST | Philadelphia 76ers | Wells Fargo Center - PA | Philadelphia | Flat | - |
| Boston Celtics at Toronto Raptors Wed, 11/11/2026 6:00 PM EST | Wed, 11/11/2026 6:00 PM EST | Toronto Raptors | Scotiabank Arena | Toronto | Flat | - |
| Dallas Mavericks at Boston Celtics Sun, 11/15/2026 6:00 PM EST | Sun, 11/15/2026 6:00 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Orlando Magic at Boston Celtics Mon, 11/16/2026 7:00 PM EST | Mon, 11/16/2026 7:00 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Boston Celtics at Denver Nuggets Wed, 11/18/2026 7:00 PM MST | Wed, 11/18/2026 7:00 PM MST | Denver Nuggets | Ball Arena | Denver | Flat | - |
| Boston Celtics at Sacramento Kings Sat, 11/21/2026 7:00 PM PST | Sat, 11/21/2026 7:00 PM PST | Sacramento Kings | Golden 1 Center | Sacramento | Flat | - |
| Boston Celtics at Golden State Warriors Sun, 11/22/2026 5:30 PM PST | Sun, 11/22/2026 5:30 PM PST | Golden State Warriors | Chase Center | San Francisco | Flat | - |
| NBA Cup - Boston Celtics at Washington Wizards Tue, 11/24/2026 8:00 PM EST | Tue, 11/24/2026 8:00 PM EST | Washington Wizards | Capital One Arena | Washington | Flat | - |
| Emirates NBA Cup - Atlanta Hawks at Boston Celtics Fri, 11/27/2026 8:00 PM EST | Fri, 11/27/2026 8:00 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Boston Celtics At San Antonio Spurs Sun, 11/29/2026 3:00 PM CST | Sun, 11/29/2026 3:00 PM CST | San Antonio Spurs | Frost Bank Center | San Antonio | Flat | - |
| Boston Celtics at Dallas Mavericks Mon, 11/30/2026 7:00 PM CST | Mon, 11/30/2026 7:00 PM CST | Dallas Mavericks | American Airlines Center | Dallas | Flat | - |
| Charlotte Hornets at Boston Celtics Wed, 12/02/2026 7:30 PM EST | Wed, 12/02/2026 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Emirates NBA Cup Quarterfinals - TBD at Boston Celtics (Date TBD) (If Necessary) Fri, 12/04/2026 12:00 AM EST | Fri, 12/04/2026 12:00 AM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Emirates NBA Cup Semifinals - TBD at Boston Celtics (Date TBD) (If Necessary) Tue, 12/08/2026 12:00 AM EST | Tue, 12/08/2026 12:00 AM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Boston Celtics at Brooklyn Nets Sun, 12/13/2026 3:00 PM EST | Sun, 12/13/2026 3:00 PM EST | Brooklyn Nets | Barclays Center | Brooklyn | Flat | - |
| Washington Wizards at Boston Celtics Mon, 12/14/2026 7:30 PM EST | Mon, 12/14/2026 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Utah Jazz at Boston Celtics Fri, 12/18/2026 7:30 PM EST | Fri, 12/18/2026 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Detroit Pistons at Boston Celtics Sun, 12/20/2026 8:00 PM EST | Sun, 12/20/2026 8:00 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Portland Trail Blazers at Boston Celtics Wed, 12/23/2026 7:30 PM EST | Wed, 12/23/2026 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Miami Heat at Boston Celtics Fri, 12/25/2026 2:30 PM EST | Fri, 12/25/2026 2:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Cleveland Cavaliers at Boston Celtics Mon, 12/28/2026 8:00 PM EST | Mon, 12/28/2026 8:00 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Boston Celtics at Chicago Bulls Wed, 12/30/2026 7:00 PM CST | Wed, 12/30/2026 7:00 PM CST | Chicago Bulls | United Center | Chicago | Flat | - |
| Boston Celtics at Utah Jazz Fri, 01/01/2027 7:30 PM MST | Fri, 01/01/2027 7:30 PM MST | Utah Jazz | Delta Center | Salt Lake City | Flat | - |
| Boston Celtics at Portland Trail Blazers Sat, 01/02/2027 7:00 PM PST | Sat, 01/02/2027 7:00 PM PST | Portland Trail Blazers | Moda Center | Portland | Flat | - |
| Boston Celtics at Phoenix Suns Mon, 01/04/2027 7:00 PM MST | Mon, 01/04/2027 7:00 PM MST | Phoenix Suns | Footprint Center | Phoenix | Flat | - |
| Boston Celtics at Los Angeles Lakers Thu, 01/07/2027 7:00 PM PST | Thu, 01/07/2027 7:00 PM PST | Los Angeles Lakers | Crypto.com Arena | Los Angeles | Flat | - |
| Boston Celtics at LA Clippers Sat, 01/09/2027 7:30 PM PST | Sat, 01/09/2027 7:30 PM PST | Los Angeles Clippers | Intuit Dome | Inglewood | Flat | - |
| Houston Rockets at Boston Celtics Mon, 01/11/2027 7:30 PM EST | Mon, 01/11/2027 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Boston Celtics at Washington Wizards Mon, 01/18/2027 3:00 PM EST | Mon, 01/18/2027 3:00 PM EST | Washington Wizards | Capital One Arena | Washington | Flat | - |
| Indiana Pacers at Boston Celtics Wed, 01/20/2027 7:30 PM EST | Wed, 01/20/2027 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Philadelphia 76ers at Boston Celtics Thu, 01/21/2027 7:30 PM EST | Thu, 01/21/2027 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Toronto Raptors at Boston Celtics Mon, 01/25/2027 7:00 PM EST | Mon, 01/25/2027 7:00 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| LA Clippers at Boston Celtics Wed, 01/27/2027 7:30 PM EST | Wed, 01/27/2027 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Phoenix Suns at Boston Celtics Fri, 01/29/2027 7:30 PM EST | Fri, 01/29/2027 7:30 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
| Los Angeles Lakers at Boston Celtics Tue, 02/02/2027 8:00 PM EST | Tue, 02/02/2027 8:00 PM EST | Boston Celtics | TD Garden | Boston | Flat | - |
