| 12/2/19 |
Miami Marlins designated RHP Tayron Guerrero for assignment. |
| 12/2/19 |
Miami Marlins designated SS JT Riddle for assignment. |
| 12/2/19 |
Baltimore Orioles traded 2B Jonathan Villar to Miami Marlins for LHP Easton Lucas. |
| 12/2/19 |
SS JT Riddle elected free agency. |
| 12/2/19 |
Miami Marlins claimed 1B Jesus Aguilar off waivers from Tampa Bay Rays. |
| 12/6/19 |
Chicago White Sox claimed RHP Tayron Guerrero off waivers from Miami Marlins. |
| 12/9/19 |
Colorado Rockies claimed RHP Tyler Kinley off waivers from Miami Marlins. |
| 12/12/19 |
Miami Marlins claimed RHP Sterling Sharp off waivers from Harrisburg Senators. |
| 12/18/19 |
Miami Marlins invited non-roster C B.J. Lopez to spring training. |
| 12/18/19 |
Miami Marlins invited non-roster C Santiago Chavez to spring training. |
| 12/18/19 |
Miami Marlins signed free agent C Ryan Lavarnway to a minor league contract and invited him to spring training. |
| 12/18/19 |
Miami Marlins signed free agent LF Matt Kemp to a minor league contract and invited him to spring training. |
| 12/18/19 |
Miami Marlins signed free agent RHP Aaron Northcraft to a minor league contract and invited him to spring training. |
| 12/18/19 |
Miami Marlins signed free agent RHP Josh A. Smith to a minor league contract and invited him to spring training. |
| 12/18/19 |
Miami Marlins signed free agent C Brian Navarreto to a minor league contract and invited him to spring training. |
| 12/18/19 |
Miami Marlins signed free agent 2B Gosuke Katoh to a minor league contract and invited him to spring training. |
| 12/18/19 |
Miami Marlins signed free agent 2B Christian Lopes to a minor league contract and invited him to spring training. |
| 12/20/19 |
Miami Marlins designated RHP Kyle Keller for assignment. |
| 12/20/19 |
Miami Marlins signed free agent RHP Yimi Garcia. |