| | 中鋒 | Signed/Offer Sheet (The Boston Celtics signed C Neemias Queta to a rest-of-season contract.) |
| | 小前鋒 | Recalled from Minors (The Boston Celtics recalled F Jordan Walsh from the minors.) |
| | 控球後衛 | Recalled from Minors (The Boston Celtics recalled G Jaden Springer for the G League.) |
| | 控球後衛 | Assigned to Minors (The Boston Celtics assigned G Jaden Springer to the minors.) |
| | 小前鋒 | Assigned to Minors (The Boston Celtics assigned F Jordan Walsh to the minors.) |
| | 控球後衛 | Traded (The Philadelphia 76ers traded G Jaden Springer to the Boston Celtics.) 從 |
| | 小前鋒 | Traded (The Boston Celtics traded F Dalano Banton to the Portland Trail Blazers.) 至 |
| | 大前鋒 | Traded (The Boston Celtics traded F Lamar Stevens to the Memphis Grizzlies.) 至 |
| | 大前鋒 | Traded (The Memphis Grizzlies traded F-C Xavier Tillman Sr. to the Boston Celtics.) 從 |
| | 大前鋒 | Signed/Offer Sheet (The Boston Celtics signed F Drew Peterson to a two-way contract.) |
| | 大前鋒 | Waived (The Boston Celtics waived F-C Nathan Knight.) |
| | 控球後衛 | Other Transaction (The Boston Celtics converted G JD Davison to a two-way contract. ) |
| | 大前鋒 | Other Transaction (The Boston Celtics converted F-C Nathan Knight to a two-way contract. ) |
| | 得分後衛 | Waived (The Boston Celtics waived G Jay Scrubb.) |
| | 大前鋒 | Signed/Offer Sheet (The Boston Celtics signed F-C Nathan Knight.) |
| | 大前鋒 | Waived (Boston Celtics waived Forward Wenyen Gabriel) |
| | 得分後衛 | Waived (The Boston Celtics waived G DJ Steward.) |
| | 大前鋒 | Signed/Offer Sheet (The Boston Celtics signed F Wenyen Gabriel.) |
| | 大前鋒 | Waived (The Boston Celtics waived F Wenyen Gabriel.) |
| | 控球後衛 | Traded (The Portland Trail Blazers traded G Jrue Holiday to the Boston Celtics.) 從 |
| | 大前鋒 | Signed/Offer Sheet (The Boston Celtics signed F Wenyen Gabriel.) |
| | 控球後衛 | Traded (The Boston Celtics traded G Malcolm Brogdon to the Portland Trail Blazers.) 至 |
| | 中鋒 | Traded (The Boston Celtics traded C Robert Williams III to the Portland Trail Blazers.) 至 |
| | 大前鋒 | Signed/Offer Sheet (The Boston Celtics signed F Lamar Stevens.) |
| | 中鋒 | Signed/Offer Sheet (The Boston Celtics signed C Neemias Queta to a two-way contract. ) |
| | 小前鋒 | Signed/Offer Sheet (The Boston Celtics signed G-F Svi Mykhailiuk.) |
| | 得分後衛 | Signed/Offer Sheet (The Boston Celtics signed G DJ Steward to a training camp contract. ) |
| | 小前鋒 | Waived (The Boston Celtics waived G Justin Champagnie.) |
| | 得分後衛 | Signed/Offer Sheet (The Boston Celtics signed G Jay Scrubb to a two-way contract.) |
| | 小前鋒 | Signed/Offer Sheet (The Boston Celtics signed F Dalano Banton.) |
| | 中鋒 | Re-Signed (The Boston Celtics re-signed C Mfiondu Kabengele.) |
| | 控球後衛 | Re-Signed (The Boston Celtics re-signed G JD Davison.) |
| | 小前鋒 | Signed/Offer Sheet (The Boston Celtics signed F-G Oshae Brissett.) |
| | 控球後衛 | Declared Free Agency (G JD Davison declared free agency.) |
| | 中鋒 | Declared Free Agency (C Mfiondu Kabengele declared free agency.) |
| | 大前鋒 | Declared Free Agency (F Blake Griffin declared free agency.) |
| | 大前鋒 | Declared Free Agency (F Grant Williams declared free agency.) |
| | 中鋒 | Traded (The Boston Celtics traded F-C Mike Muscala to the Washington Wizards.) 至 |
| | 小前鋒 | Traded (The Boston Celtics traded F Danilo Gallinari to the Washington Wizards.) 至 |
| | 大前鋒 | Traded (The Washington Wizards traded F-C Kristaps Porzingis to the Boston Celtics.) 從 |
| | 控球後衛 | Traded (The Boston Celtics traded G Marcus Smart to the Memphis Grizzlies.) 至 |
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