Red Sox Roster & Staff
Transactions
| Date | Transaction |
| 01/25/21 | New York Yankees traded RHP Adam Ottavino and RHP Frank German to Boston Red Sox for Player To Be Named Later. |
| 01/25/21 | New York Yankees traded RHP Adam Ottavino and RHP Frank German to Boston Red Sox for Player To Be Named Later. |
| 01/22/21 | Boston Red Sox signed free agent RHP Matt Carasiti to a minor league contract and invited him to spring training. |
| 01/22/21 | Boston Red Sox signed free agent P Matt Carasiti. |
| 01/22/21 | Boston Red Sox signed free agent RHP Matt Carasiti to a minor league contract and invited him to spring training. |
| 01/19/21 | Boston Red Sox signed free agent RHP Jose Adames to a minor league contract. |
| 01/18/21 | Boston Red Sox signed free agent RHP Zac Grotz to a minor league contract and invited him to spring training. |
| 01/18/21 | Boston Red Sox signed free agent RHP Zac Grotz to a minor league contract and invited him to spring training. |
| 01/18/21 | Boston Red Sox traded SS C.J. Chatham to Philadelphia Phillies for Player To Be Named Later. |
| 01/18/21 | Boston Red Sox signed free agent P Zac Grotz. |
| 01/16/21 | Boston Red Sox signed free agent 2B Jack Lopez to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent RHP Yizreel Burnet to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent OF Elvys Castro to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent SS Josue Castillo to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent RHP Jean Carlos Reyes to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent IF Helison Mota to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent IF Ahbram Liendo to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent SS Luis Ravelo to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent IF Yevganni Reinita to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent OF Armando Sierra to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent OF Karim Ayubi to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent RHP Alvaro Mejias to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent P Angel Lopez. |
| 01/15/21 | Boston Red Sox signed free agent OF Miguel Bleis to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent C Enderso Lira to a minor league contract. |
| 01/15/21 | Boston Red Sox signed free agent RHP Jedixson Paez to a minor league contract. |
| 01/04/21 | Boston Red Sox signed free agent SS Jeremy Rivera to a minor league contract. |
| 01/04/21 | Boston Red Sox signed free agent RHP Zack Kelly to a minor league contract. |