| 8/9/2021 | Signd F Ross Colton to a two-year contract. |
| 8/1/2021 | Signed D Sean Day to a one-year, two-way contract. |
| 7/31/2021 | Acquired future considerations from VAN in exchange for G Spencer Martin. |
| 7/31/2021 | Signed F Boris Katchouk to a three-year contract. |
| 7/31/2021 | Signed F Taylor Raddysh to a three-year contract. |
| 7/30/2021 | Acquired a 2022 6th round pick from DET in exchange for F Mitchell Stephens. |
| 7/302021 | Signed F Alex Barre-Boulet to a three-year contract. |
| 7/29/2021 | Signed D Cal Foote to a two-year contract. |
| 7/29/2021 | Signed F Corey Perry to a two-year contract. |
| 7/28/2021 | Signed F Remi Elie to a one-year, two-way contract. |
| 7/28/2021 | Signed F Pierre-Edouard Bellemare to a two-year contract. |
| 7/28/2021 | Signed F Brayden Point to an eight-year contract extension. |
| 7/28/2021 | Signed D Zach Bogosian to a three-year contract. |
| 7/28/2021 | Signed G Brian Elliott to a one-year contract. |
| 7/28/2021 | Signed G Maxime Lagace to a one-year, two-way contract. |
| 7/28/2021 | Signed D Andrej Sustr to a one-year, two-way contract. |
| 7/28/2021 | Signed D Darren Raddysh to a one-year, two-way contract. |
| 7/28/2021 | Signed F Charles Hudon to a one-year, two-way contract. |
| 7/28/2021 | Signed F Gabriel Dumont to a one-year, two-way contract. |
| 7/27/2021 | Acquired D Brent Seabrook from CHI in exchange for F Tyler Johnson and a 2023 2nd round pick. |
| 7/27/2021 | Signed F Otto Somppi to a one-year, two-way contract. |
| 7/24/2021 | Acquired a 2021 4th round pick from MTL in exchange for a 2022 4th round pick. |
| 7/23/2021 | Signed F Gemel Smith to a two-year, two-way contract. |
| 7/17/2021 | Acquired a 2022 7th round draft pick from NYR in exchange for F Barclay Goodrow. |
| 7/17/2021 | Signed D Fredrik Claesson to a one-year, two-way contract. |
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