Marlins Roster & Staff
Transactions
| Date | Transaction |
| 09/30/20 | Miami Marlins reassigned RHP Jorge Guzman to the minor leagues. |
| 09/30/20 | Miami Marlins reassigned LHP Daniel Castano to the minor leagues. |
| 09/30/20 | Miami Marlins reassigned RHP Edward Cabrera to the minor leagues. |
| 09/30/20 | Miami Marlins reassigned RHP Jose Urena to the minor leagues. |
| 09/30/20 | Miami Marlins reassigned RHP Jordan Yamamoto to the minor leagues. |
| 09/30/20 | Miami Marlins recalled RHP Nick Neidert from Marlins Alternate Training Site. |
| 09/30/20 | Miami Marlins reassigned LHP Alex Vesia to the minor leagues. |
| 09/30/20 | Miami Marlins reassigned RF Jesus Sanchez to the minor leagues. |
| 09/30/20 | Miami Marlins reassigned RHP Johan Quezada to the minor leagues. |
| 09/30/20 | Miami Marlins reassigned RHP Nick Vincent to the minor leagues. |
| 09/28/20 | Miami Marlins signed free agent RHP Yoelvis Burguillos to a minor league contract. |
| 09/28/20 | Miami Marlins recalled RHP Edward Cabrera from Marlins Alternate Training Site. |
| 09/28/20 | Miami Marlins recalled LHP Alex Vesia from Marlins Alternate Training Site. |
| 09/28/20 | Miami Marlins recalled RHP Johan Quezada from Marlins Alternate Training Site. |
| 09/28/20 | Miami Marlins recalled RHP Jordan Yamamoto from Marlins Alternate Training Site. |
| 09/28/20 | Miami Marlins recalled RF Jesus Sanchez from Marlins Alternate Training Site. |
| 09/28/20 | Miami Marlins recalled RHP Jorge Guzman from Marlins Alternate Training Site. |
| 09/28/20 | Miami Marlins recalled 1B Lewin Diaz from Marlins Alternate Training Site. |
| 09/28/20 | Miami Marlins recalled LHP Braxton Garrett from Marlins Alternate Training Site. |
| 09/25/20 | Miami Marlins invited non-roster RHP Brett Eibner to spring training. |
| 09/25/20 | Miami Marlins sent RHP Brett Eibner outright to Marlins Alternate Training Site. |
| 09/24/20 | Miami Marlins optioned RHP Nick Neidert to Marlins Alternate Training Site. |
| 09/24/20 | Miami Marlins activated RF Magneuris Sierra from the 10-day injured list. |
| 09/24/20 | Miami Marlins activated CF Magneuris Sierra from the 10-day injured list. |
| 09/24/20 | Miami Marlins activated RF Magneuris Sierra from the 10 day injured list. |
| 09/24/20 | Miami Marlins recalled LHP Daniel Castano from Marlins Alternate Training Site. |
| 09/24/20 | Miami Marlins placed RHP Josh A. Smith on the 10-day injured list. Fractured nail. |
| 09/23/20 | Miami Marlins activated LHP Stephen Tarpley from the 10-day injured list. |
| 09/23/20 | Miami Marlins designated Brett Eibner for assignment. |
| 09/22/20 | Miami Marlins sent 3B Sean Rodriguez outright to Marlins Alternate Training Site. |
| 09/21/20 | Miami Marlins selected the contract of RHP Brett Eibner from Marlins Alternate Training Site. |
| 09/21/20 | Miami Marlins optioned RHP Robert Dugger to Marlins Alternate Training Site. |
| 09/21/20 | Miami Marlins optioned LHP Braxton Garrett to Marlins Alternate Training Site. |
| 09/20/20 | Miami Marlins designated 3B Sean Rodriguez for assignment. |
| 09/20/20 | Miami Marlins activated 2B Jon Berti from the 10 day injured list. |
| 09/20/20 | Miami Marlins activated 2B Jon Berti from the 10-day injured list. |
| 09/20/20 | Miami Marlins activated 3B Jon Berti from the 10-day injured list. |
| 09/20/20 | Miami Marlins recalled Braxton Garrett from Marlins Alternate Training Site. |
| 09/19/20 | Miami Marlins traded LHP Julio Frias to Arizona Diamondbacks. |
| 09/19/20 | Miami Marlins optioned LHP Daniel Castano to Marlins Alternate Training Site. |
| 09/18/20 | Toronto Blue Jays traded OF Griffin Conine to Miami Marlins. |
| 09/18/20 | Miami Marlins recalled Robert Dugger from Marlins Alternate Training Site. |
| 09/18/20 | Miami Marlins optioned RHP Johan Quezada to Marlins Alternate Training Site. |
| 09/18/20 | Miami Marlins recalled Daniel Castano from Marlins Alternate Training Site. |
| 09/18/20 | Miami Marlins traded SS Isaac De Leon to Baltimore Orioles. |
| 09/17/20 | Miami Marlins sent SS Eddy Alvarez outright to Marlins Alternate Training Site. |
| 09/15/20 | Miami Marlins activated 3B Sean Rodriguez from the 60-day injured list. |
| 09/15/20 | Miami Marlins placed 2B Isan Diaz on the 60-day injured list. Left groin strain. |
| 09/14/20 | Miami Marlins optioned LHP Braxton Garrett to Marlins Alternate Training Site. |
| 09/13/20 | Miami Marlins selected the contract of Braxton Garrett from Marlins Alternate Training Site. |
| 09/13/20 | Miami Marlins optioned LHP Daniel Castano to Marlins Alternate Training Site. |
| 09/13/20 | Miami Marlins transferred LHP Brandon Leibrandt from the 10-day injured list to the 60-day injured list. Left elbow ulnar neuritis. |
| 09/13/20 | Nick Neidert roster status changed by Miami Marlins. |
| 09/13/20 | Miami Marlins designated Eddy Alvarez for assignment. |
| 09/12/20 | Miami Marlins optioned RHP Robert Dugger to Marlins Alternate Training Site. |
| 09/11/20 | Miami Marlins recalled Robert Dugger from Marlins Alternate Training Site. |
| 09/11/20 | Miami Marlins selected the contract of Johan Quezada from Marlins Alternate Training Site. |
| 09/10/20 | Miami Marlins optioned RHP Jordan Yamamoto to Marlins Alternate Training Site. |
| 09/10/20 | Miami Marlins optioned LHP Alex Vesia to Marlins Alternate Training Site. |
| 09/10/20 | Miami Marlins recalled Daniel Castano from Marlins Alternate Training Site. |
| 09/10/20 | Miami Marlins recalled 2B Isan Diaz from Marlins Alternate Training Site. |
| 09/10/20 | Miami Marlins placed 3B Jon Berti on the 10-day injured list. Right index finger laceration. |
| 09/10/20 | Miami Marlins transferred C Francisco Cervelli from the 10-day injured list to the 60-day injured list. Concussion. |
| 09/10/20 | Miami Marlins placed 2B Isan Diaz on the 60-day injured list. Left groin strain. |
| 09/09/20 | Miami Marlins released RHP Justin Shafer. |
| 09/09/20 | Miami Marlins optioned 2B Isan Diaz to Marlins Alternate Training Site. |
| 09/09/20 | Miami Marlins invited non-roster OF Connor Scott to spring training. |
| 09/09/20 | Miami Marlins designated RHP Justin Shafer for assignment. |
| 09/08/20 | Miami Marlins recalled Jordan Yamamoto from Marlins Alternate Training Site. |
| 09/08/20 | Miami Marlins optioned 1B Lewin Diaz to Marlins Alternate Training Site. |
| 09/07/20 | Miami Marlins optioned SS Eddy Alvarez to Marlins Alternate Training Site. |
| 09/07/20 | Miami Marlins activated RHP Jose Urena from the 10-day injured list. |
| 09/07/20 | Miami Marlins placed LHP Brandon Leibrandt on the 10-day injured list. Left elbow ulnar neuritis |
| 09/07/20 | Miami Marlins transferred CF Harold Ramirez from the 10-day injured list to the 60-day injured list. Left hamstring strain. |
| 09/07/20 | Miami Marlins recalled CF Monte Harrison from Marlins Alternate Training Site. |
| 09/06/20 | Miami Marlins recalled Eddy Alvarez from Marlins Alternate Training Site. |
| 09/06/20 | Miami Marlins sent LHP Adam Conley outright to Wichita Wind Surge. |
| 09/06/20 | Miami Marlins placed CF Harold Ramirez on the 10-day injured list. Left hamstring strain. |
| 09/05/20 | Miami Marlins optioned SS Eddy Alvarez to Marlins Alternate Training Site. |
| 09/05/20 | Miami Marlins activated CF Harold Ramirez from the 10-day injured list. |
| 09/05/20 | Miami Marlins transferred RHP Elieser Hernandez from the 10-day injured list to the 60-day injured list. Strained right latissimus dorsi. |
| 09/04/20 | Miami Marlins optioned RHP Robert Dugger to Marlins Alternate Training Site. |
| 09/04/20 | Miami Marlins activated RHP Ryne Stanek from the 10-day injured list. |
| 09/03/20 | Miami Marlins sent RHP Brett Eibner outright to Marlins Alternate Training Site. |
| 09/03/20 | Colorado Rockies claimed RHP Jesus Tinoco off waivers from Miami Marlins. |
| 09/03/20 | Miami Marlins sent C Brian Navarreto outright to Marlins Alternate Training Site. |
| 09/02/20 | Miami Marlins recalled Eddy Alvarez from Marlins Alternate Training Site. |
| 09/02/20 | Miami Marlins placed RHP Elieser Hernandez on the 10-day injured list. Strained right latissimus dorsi. |
| 09/01/20 | Miami Marlins placed C Francisco Cervelli on the 10-day injured list. Concussion. |
| 09/01/20 | Miami Marlins invited non-roster LHP Josh D. Smith to spring training. |
| 09/01/20 | Miami Marlins recalled SS Jazz Chisholm from Marlins Alternate Training Site. |
| 09/01/20 | Miami Marlins released LHP Josh D. Smith. |
| 09/01/20 | Miami Marlins activated CF Starling Marte. |
| 09/01/20 | Miami Marlins sent LHP Josh D. Smith outright to Marlins Alternate Training Site. |
| 09/01/20 | Miami Marlins optioned RF Jesus Sanchez to Marlins Alternate Training Site. |