Mariners Roster & Staff
Transactions
| Date | Transaction |
| 01/09/25 | Seattle Mariners claimed LHP Tyler Jay off waivers from Milwaukee Brewers. |
| 01/08/25 | Seattle Mariners claimed RHP Hagen Danner off waivers from Toronto Blue Jays. |
| 01/03/25 | Seattle Mariners signed free agent LHP Josh Fleming to a minor league contract. |
| 01/02/25 | Seattle Mariners signed free agent RHP Dylan File to a minor league contract. |