Mariners Roster & Staff
Transactions
| Date | Transaction |
| 02/28/25 | C Andrew Miller assigned to Seattle Mariners. |
| 02/27/25 | C Connor Dykstra assigned to Seattle Mariners. |
| 02/27/25 | 2B Josh Hood assigned to Seattle Mariners. |
| 02/27/25 | SS Felnin Celesten assigned to Seattle Mariners. |
| 02/27/25 | RHP Dylan File assigned to Seattle Mariners. |
| 02/27/25 | LHP Danny Wirchansky assigned to Seattle Mariners. |
| 02/27/25 | RHP Evan Truitt assigned to Seattle Mariners. |
| 02/27/25 | LHP Jack White assigned to Seattle Mariners. |
| 02/27/25 | RHP Ryan Hawks assigned to Seattle Mariners. |
| 02/27/25 | C Jose Caguana assigned to Seattle Mariners. |
| 02/27/25 | RHP Gabriel Sosa assigned to Seattle Mariners. |
| 02/27/25 | OF Anthony Donofrio assigned to Seattle Mariners. |
| 02/26/25 | LF Carson Jones assigned to Seattle Mariners. |
| 02/25/25 | RHP Brock Moore assigned to Seattle Mariners. |
| 02/25/25 | Seattle Mariners signed free agent RHP Trevor Gott to a minor league contract and invited him to spring training. |
| 02/25/25 | RHP Harrison Kreiling assigned to Seattle Mariners. |
| 02/25/25 | 3B Caleb Cali assigned to Seattle Mariners. |
| 02/25/25 | 2B Blake Rambusch assigned to Seattle Mariners. |
| 02/25/25 | RHP Gage Boehm assigned to Seattle Mariners. |
| 02/25/25 | RHP Yorlin Calderon assigned to Seattle Mariners. |
| 02/24/25 | 3B Milkar Perez assigned to Seattle Mariners. |
| 02/24/25 | RHP Elijah Dale assigned to Seattle Mariners. |
| 02/24/25 | RHP Jason Ruffcorn assigned to Seattle Mariners. |
| 02/23/25 | RHP Stefan Raeth assigned to Seattle Mariners. |
| 02/23/25 | 3B Brandon Eike assigned to Seattle Mariners. |
| 02/23/25 | RHP Christian Little assigned to Seattle Mariners. |
| 02/23/25 | 1B Luis Suisbel assigned to Seattle Mariners. |
| 02/22/25 | RHP Charlie Beilenson assigned to Seattle Mariners. |
| 02/22/25 | RHP Wyatt Lunsford-Shenkman assigned to Seattle Mariners. |
| 02/22/25 | RHP Jesse Wainscott assigned to Seattle Mariners. |
| 02/22/25 | CF Carlos Jimenez assigned to Seattle Mariners. |
| 02/22/25 | RHP Jimmy Joyce assigned to Seattle Mariners. |
| 02/22/25 | 3B Charlie Pagliarini assigned to Seattle Mariners. |
| 02/22/25 | RHP Taylor Floyd assigned to Seattle Mariners. |
| 02/22/25 | 2B Jack López assigned to Seattle Mariners. |
| 02/22/25 | OF Jared Sundstrom assigned to Seattle Mariners. |
| 02/22/25 | 3B Tai Peete assigned to Seattle Mariners. |
| 02/22/25 | RHP Juan Burgos assigned to Seattle Mariners. |
| 02/21/25 | Seattle Mariners signed free agent 1B Rowdy Tellez to a minor league contract and invited him to spring training. |
| 02/21/25 | OF Bill Knight assigned to Seattle Mariners. |
| 02/21/25 | RHP Jimmy Kingsbury assigned to Seattle Mariners. |
| 02/21/25 | 1B Hogan Windish assigned to Seattle Mariners. |
| 02/19/25 | Seattle Mariners signed free agent RHP Kleiver Benitez to a minor league contract. |
| 02/15/25 | Seattle Mariners signed free agent LHP Jhonathan Díaz to a minor league contract and invited him to spring training. |
| 02/15/25 | Seattle Mariners signed free agent RHP Garrett Hill to a minor league contract. |
| 02/07/25 | LHP Jhonathan Díaz elected free agency. |
| 02/07/25 | Seattle Mariners sent LF Cade Marlowe outright to Tacoma Rainiers. |
| 02/03/25 | Seattle Mariners signed free agent 2B Jorge Polanco. |
| 02/03/25 | Seattle Mariners designated LHP Jhonathan Díaz for assignment. |
| 02/03/25 | Seattle Mariners designated LF Cade Marlowe for assignment. |
| 02/03/25 | Cincinnati Reds traded RHP Casey Legumina to Seattle Mariners for cash. |