Mariners Roster & Staff
Transactions
| Date | Transaction |
| 12/19/24 | Seattle Mariners claimed C Nick Raposo off waivers from Toronto Blue Jays. |
| 12/10/24 | Seattle Mariners signed free agent C Jacob Nottingham to a minor league contract. |
| 12/09/24 | Seattle Mariners signed free agent RHP Yunior Marte to a minor league contract. |
| 12/08/24 | Seattle Mariners signed free agent RHP Yorlin Calderon to a minor league contract. |
| 12/07/24 | Seattle Mariners signed free agent 1B Sauryn Lao to a minor league contract. |
| 12/05/24 | RHP Emerson Hancock changed number to 26. |
| 12/05/24 | Seattle Mariners signed free agent LHP Drew Pomeranz to a minor league contract. |
| 12/02/24 | Seattle Mariners signed free agent RHP Dauris Valdez to a minor league contract. |