Marlins Roster & Staff
Transactions
| Date | Transaction |
| 12/21/23 | RHP Anderson Pilar assigned to Miami Marlins. |
| 12/20/23 | Miami Marlins designated RHP Ryan Jensen for assignment. |
| 12/20/23 | Pittsburgh Pirates traded RHP Roddery Muñoz to Miami Marlins for cash. |
| 12/13/23 | Miami Marlins signed free agent OF Diego Infante to a minor league contract. |
| 12/10/23 | Cleveland Guardians traded C Christian Bethancourt to Miami Marlins for cash. |
| 12/08/23 | Miami Marlins traded CF Jake Mangum to Tampa Bay Rays. |
| 12/02/23 | LHP Devin Smeltzer roster status changed by Miami Marlins. |
| 12/02/23 | Miami Marlins signed free agent LHP Devin Smeltzer to a minor league contract. |
| 12/01/23 | Miami Marlins claimed RHP Kaleb Ort off waivers from Seattle Mariners. |