Marlins Roster & Staff
Transactions
| Date | Transaction |
| 11/30/20 | Cleveland Indians traded RHP Adam Cimber to Miami Marlins for cash. |
| 11/30/20 | RHP Anthony Bender roster status changed by Miami Marlins. |
| 11/30/20 | P Anthony Bender roster status changed by Miami Marlins. |
| 11/30/20 | Miami Marlins designated RHP Jose Urena for assignment. |
| 11/30/20 | RHP Anthony Bender roster status changed by Miami Marlins. |
| 11/30/20 | Miami Marlins signed free agent RHP Anthony Bender to a minor league contract. |
| 11/23/20 | Miami Marlins signed free agent RHP Zach Thompson to a minor league contract and invited him to spring training. |
| 11/23/20 | Miami Marlins signed free agent RHP Zach Thompson to a minor league contract and invited him to spring training. |
| 11/23/20 | Miami Marlins signed free agent P Luis Madero. |
| 11/23/20 | Miami Marlins signed free agent P Zach Thompson. |
| 11/23/20 | Miami Marlins signed free agent RHP Luis Madero to a minor league contract and invited him to spring training. |
| 11/23/20 | Miami Marlins signed free agent RHP Luis Madero to a minor league contract and invited him to spring training. |
| 11/20/20 | Miami Marlins selected the contract of RF Jerar Encarnacion from Jupiter Hammerheads. |
| 11/20/20 | Miami Marlins selected the contract of SS Jose Devers from Clinton LumberKings. |
| 11/17/20 | Miami Marlins signed free agent RHP Alexander Guillen to a minor league contract and invited him to spring training. |
| 11/17/20 | Miami Marlins signed free agent RHP Alexander Guillen to a minor league contract and invited him to spring training. |
| 11/17/20 | Miami Marlins signed free agent P Alexander Guillen. |
| 11/09/20 | Monte Harrison changed number to 3. |
| 11/09/20 | Trevor Rogers changed number to 28. |
| 11/09/20 | SS Jazz Chisholm Jr. changed number to 2. |
| 11/09/20 | Richard Bleier changed number to 48. |
| 11/09/20 | Sixto Sanchez changed number to 45. |
| 11/09/20 | LHP Trevor Rogers changed number to 28. |
| 11/09/20 | James Hoyt changed number to 51. |
| 11/09/20 | Nick Neidert changed number to 29. |
| 11/09/20 | Alex Vesia changed number to 35. |
| 11/09/20 | Jazz Chisholm changed number to 2. |