Boston Celtics
| Date | Player | Last Season Stats | Experience | Age | Old Team | New Team | Notes |
|---|---|---|---|---|---|---|---|
| 10-18-2025 | Hason Ward (C) | - | 0 | 25 | Bos | - | Waived |
| 10-16-2025 | Kendall Brown (G/F) | - | 1 | 22 | Bos | - | Waived |
| 10-16-2025 | Wendell Moore Jr. (F/G) | - | 1 | 24 | Bos | - | Waived |
| 10-16-2025 | Jalen Bridges (F) | - | 0 | 24 | Bos | - | Waived |
| 10-15-2025 | RJ Luis Jr. (F/G) | - | 0 | 23 | Bos | - | Waived |
| 09-28-2025 | Al Horford (C/F) | 14.2 ppg, 3.4 apg, 6.7 rpg in 28 g | 16 | 39 | Bos | GS | multi-year |
| 09-20-2025 | Hayden Gray (G) | - | 0 | 22 | Bos | - | Waived |
| 08-16-2025 | Ron Harper Jr. (G/F) | - | 1 | 25 | Det | Bos | unknown |
| 08-10-2025 | Miles Norris (F) | - | 0 | 25 | Bos | - | Waived |
| 08-06-2025 | Georges Niang (F) | 6.9 ppg, 0.8 apg, 2.4 rpg in 72 g | 7 | 32 | Bos | Uta |
Traded
The Boston Celtics acquired forward/guard RJ Luis Jr. from the Utah Jazz for forward Georges Niang and two future second-round draft picks.
|
| 08-05-2025 | Chris Boucher (C/F) | 13.6 ppg, 1.1 apg, 6.7 rpg in 60 g | 6 | 33 | Tor | Bos | one-year |
| 07-26-2025 | JD Davison (G) | - | 1 | 23 | Bos | Hou | two-way |
| 07-16-2025 | Drew Peterson (F) | - | 0 | 26 | Bos | Cha | two-way |
| 07-07-2025 | Kristaps Porzingis (C/F) | 20.1 ppg, 1.6 apg, 8.9 rpg in 43 g | 7 | 30 | Bos | Atl |
Traded
In a three-team trade, the Atlanta Hawks acquired center/forward Kristaps Porzingis and a second-round draft pick in 2026 from the Boston Celtics; Boston acquired forward Georges Niang and a second-round draft pick in 2031 from the Hawks, and cash considerations from the Brooklyn Nets; and Brooklyn acquired guard Terance Mann and a first-round draft pick in 2025 (No. 22 overall) from the Hawks.
|
| 07-07-2025 | Anfernee Simons (G) | 7.8 ppg, 1.4 apg, 2.2 rpg in 64 g | 5 | 26 | Por | Bos |
Traded
The Portland Trail Blazers acquired guard Jrue Holiday from the Boston Celtics for guard Anfernee Simons.
|
| 07-07-2025 | Jrue Holiday (G) | 17.7 ppg, 6.1 apg, 4.5 rpg in 59 g | 14 | 35 | Bos | Por |
Traded
The Portland Trail Blazers acquired guard Jrue Holiday from the Boston Celtics for guard Anfernee Simons.
|
| 07-06-2025 | Luke Kornet (C/F) | 3.4 ppg, 0.8 apg, 2.2 rpg in 31 g | 6 | 30 | Bos | SA | four-year |
| 07-06-2025 | Josh Minott (F) | - | 1 | 24 | Min | Bos | two-year |
| 07-06-2025 | Luka Garza (F/C) | 2021 Draft pick (2/52) | 2 | 27 | Min | Bos | two-year |