Marlins Roster & Staff
Transactions
| Date | Transaction |
| 07/31/20 | Miami Marlins placed 2B Isan Diaz on the restricted list. |
| 07/30/20 | Miami Marlins signed free agent OF Ashton Easley to a minor league contract. |
| 07/30/20 | Miami Marlins optioned RHP Justin Shafer to Marlins Alternate Training Site. |
| 07/28/20 | Miami Marlins claimed RHP Mike Morin off waivers from Milwaukee Brewers. |
| 07/28/20 | Miami Marlins optioned LHP Josh D. Smith to Marlins Alternate Training Site. |
| 07/27/20 | Miami Marlins placed 1B Garrett Cooper on the 10-day injured list. |
| 07/27/20 | Miami Marlins placed CF Harold Ramirez on the 10-day injured list. |
| 07/27/20 | Miami Marlins claimed Josh D. Smith off waivers from Cincinnati Reds. |
| 07/27/20 | Miami Marlins claimed Justin Shafer off waivers from Cincinnati Reds. |
| 07/27/20 | Miami Marlins placed RHP Jose Urena on the 10-day injured list. |
| 07/24/20 | Miami Marlins signed free agent OF Travis Snider to a minor league contract and invited him to spring training. |
| 07/24/20 | Miami Marlins placed C Jorge Alfaro on the 10-day injured list. |
| 07/24/20 | Miami Marlins signed LHP Jake Eder. |
| 07/24/20 | Miami Marlins selected the contract of 3B Sean Rodriguez from Marlins Alternate Training Site. |
| 07/23/20 | Miami Marlins selected the contract of RHP Brad Boxberger from Marlins Alternate Training Site. |
| 07/23/20 | Miami Marlins placed RHP Drew Steckenrider on the 60-day injured list. Right triceps tendonitis. |
| 07/23/20 | Miami Marlins recalled RHP Jordan Holloway from Jacksonville Jumbo Shrimp. |
| 07/23/20 | Miami Marlins recalled RHP Nick Neidert from Wichita Wind Surge. |
| 07/23/20 | Miami Marlins selected the contract of LHP Alex Vesia from Marlins Alternate Training Site. |
| 07/22/20 | Miami Marlins signed LHP Daxton Fulton. |
| 07/21/20 | Miami Marlins signed RHP Kyle Nicolas. |
| 07/21/20 | Miami Marlins signed RHP Zach McCambley. |
| 07/21/20 | Miami Marlins signed RHP Kyle Hurt. |
| 07/20/20 | Miami Marlins released RHP Ryan Cook. |
| 07/17/20 | Miami Marlins optioned RHP Jordan Yamamoto to Marlins Alternate Training Site. |
| 07/15/20 | Miami Marlins placed LF Matt Joyce on the 60-day injured list. |
| 07/15/20 | Miami Marlins placed CF Lewis Brinson on the 10-day injured list. |
| 07/09/20 | Miami Marlins signed free agent LHP Antonio Velez to a minor league contract. |
| 07/07/20 | Miami Marlins invited non-roster RHP Max Meyer to spring training. |
| 07/06/20 | Miami Marlins placed C Will Banfield on the 10-day injured list. |
| 07/03/20 | Miami Marlins invited non-roster 3B Sean Rodriguez to spring training. |
| 07/01/20 | Miami Marlins signed free agent 3B Sean Rodriguez to a minor league contract. |
| 07/01/20 | Miami Marlins signed RHP Max Meyer. |