Marlins Roster & Staff
Transactions
| Date | Transaction |
| 02/26/21 | Miami Marlins signed free agent P Steven Okert. |
| 02/24/21 | Cleveland Indians claimed CF Harold Ramirez off waivers from Miami Marlins. |
| 02/21/21 | Miami Marlins invited non-roster LHP Dylan Lee to spring training. |
| 02/21/21 | Miami Marlins invited non-roster RHP Zach McCambley to spring training. |
| 02/21/21 | Miami Marlins invited non-roster OF Peyton Burdick to spring training. |
| 02/21/21 | Miami Marlins invited non-roster OF Brian Miller to spring training. |
| 02/21/21 | Miami Marlins invited non-roster OF Kameron Misner to spring training. |
| 02/21/21 | P Cody Poteet assigned to Miami Marlins . |
| 02/21/21 | P Jake Fishman assigned to Miami Marlins . |
| 02/21/21 | Miami Marlins invited non-roster LHP Jake Eder to spring training. |
| 02/21/21 | Miami Marlins invited non-roster RHP Cody Poteet to spring training. |
| 02/21/21 | Miami Marlins invited non-roster C Will Banfield to spring training. |
| 02/21/21 | Miami Marlins invited non-roster C Cameron Barstad to spring training. |
| 02/21/21 | Miami Marlins invited non-roster OF Victor Victor Mesa to spring training. |
| 02/21/21 | Miami Marlins invited non-roster LHP Jake Fishman to spring training. |
| 02/21/21 | Miami Marlins invited non-roster LHP Zach King to spring training. |
| 02/21/21 | Miami Marlins invited non-roster RHP Kyle Nicolas to spring training. |
| 02/21/21 | Miami Marlins invited non-roster LHP Will Stewart to spring training. |
| 02/21/21 | Miami Marlins invited non-roster RHP Josh Roberson to spring training. |
| 02/21/21 | Miami Marlins invited non-roster OF Connor Scott to spring training. |
| 02/21/21 | Miami Marlins invited non-roster SS Joe Dunand to spring training. |
| 02/21/21 | Miami Marlins invited non-roster SS Nasim Nunez to spring training. |
| 02/21/21 | OF JJ Bleday assigned to Miami Marlins . |
| 02/21/21 | Miami Marlins invited non-roster RHP Max Meyer to spring training. |
| 02/21/21 | SS Nasim Nunez assigned to Miami Marlins . |
| 02/21/21 | C Nick Fortes assigned to Miami Marlins . |
| 02/21/21 | Miami Marlins invited non-roster RHP Tommy Eveld to spring training. |
| 02/21/21 | Miami Marlins invited non-roster C Nick Fortes to spring training. |
| 02/21/21 | Miami Marlins invited non-roster OF JJ Bleday to spring training. |
| 02/21/21 | SS Joe Dunand assigned to Miami Marlins . |
| 02/21/21 | C Will Banfield assigned to Miami Marlins . |
| 02/19/21 | Richard Bleier changed number to 35. |
| 02/19/21 | Miami Marlins activated LHP Richard Bleier. |
| 02/19/21 | Daniel Castano changed number to 72. |
| 02/19/21 | Miami Marlins activated LHP Richard Bleier. |
| 02/19/21 | LHP Richard Bleier changed number to 35. |
| 02/17/21 | Miami Marlins placed RHP Jeff Brigham on the 60-day injured list. |
| 02/17/21 | Miami Marlins designated CF Harold Ramirez for assignment. |
| 02/17/21 | Miami Marlins signed free agent LF Adam Duvall. |
| 02/17/21 | Miami Marlins signed free agent LF Adam Duvall. |
| 02/17/21 | Miami Marlins signed free agent LF Adam Duvall. |
| 02/17/21 | Tampa Bay Rays traded RHP John Curtiss to Miami Marlins for 1B Evan Edwards. |
| 02/17/21 | Miami Marlins signed free agent LF Adam Duvall. |
| 02/17/21 | Tampa Bay Rays traded RHP John Curtiss to Miami Marlins for 1B Evan Edwards. |
| 02/16/21 | Miami Marlins signed free agent P Shawn Morimando. |
| 02/16/21 | Miami Marlins signed free agent LHP Shawn Morimando to a minor league contract and invited him to spring training. |
| 02/12/21 | traded to Miami Marlins for . |
| 02/12/21 | Miami Marlins traded LHP Alex Vesia and RHP Kyle Hurt to Los Angeles Dodgers for Dylan Floro. |
| 02/12/21 | Miami Marlins traded LHP Alex Vesia and RHP Kyle Hurt to Los Angeles Dodgers for Dylan Floro. |
| 02/12/21 | Miami Marlins traded LHP Alex Vesia and RHP Kyle Hurt to Los Angeles Dodgers for Dylan Floro. |
| 02/06/21 | Alex Vesia changed number to 41. |
| 02/01/21 | Miami Marlins traded RHP Jordan Yamamoto to New York Mets for SS Federico Polanco. |
| 02/01/21 | Miami Marlins traded RHP Jordan Yamamoto to New York Mets for SS Federico Polanco. |