| 12/3/18 |
Miami Marlins invited non-roster OF Victor Victor Mesa to spring training. |
| 12/3/18 |
Miami Marlins invited non-roster C Sharif Othman to spring training. |
| 12/3/18 |
Miami Marlins invited non-roster C B.J. Lopez to spring training. |
| 12/3/18 |
Miami Marlins signed free agent RF Harold Ramirez to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent C Rodrigo Vigil to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent C Bryan Holaday to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent LHP Mike Kickham to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent LHP Brian Moran to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent 3B Jon Berti to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent 1B Pedro Alvarez to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent RHP R.J. Alvarez to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent RF Gabriel Guerrero to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent SS Dixon Machado to a minor league contract and invited him to spring training. |
| 12/3/18 |
Miami Marlins signed free agent 3B Deven Marrero to a minor league contract and invited him to spring training. |
| 12/10/18 |
Miami Marlins sent RHP Brett Graves outright to New Orleans Baby Cakes. |
| 12/10/18 |
Miami Marlins sent 3B Yadiel Rivera outright to New Orleans Baby Cakes. |
