Mariners Roster & Staff
Transactions
| Date | Transaction |
| 01/31/24 | Seattle Mariners signed free agent RHP Mathias Sato to a minor league contract. |
| 01/31/24 | Seattle Mariners signed free agent RHP Danery Meyer to a minor league contract. |
| 01/31/24 | Seattle Mariners signed free agent RHP Deybi Castro to a minor league contract. |
| 01/30/24 | Seattle Mariners signed free agent RHP Juan Jimenez to a minor league contract. |
| 01/30/24 | Kansas City Royals traded 2B Samad Taylor to Seattle Mariners for Player To Be Named Later. |
| 01/29/24 | Minnesota Twins traded SS Jorge Polanco to Seattle Mariners for RHP Anthony DeSclafani, RHP Justin Topa, OF Gabriel Gonzalez, RHP Darren Bowen and cash. |
| 01/29/24 | Minnesota Twins traded SS Jorge Polanco to Seattle Mariners for RHP Anthony DeSclafani, RHP Justin Topa, OF Gabriel Gonzalez, RHP Darren Bowen and cash. |
| 01/29/24 | Minnesota Twins traded SS Jorge Polanco to Seattle Mariners for RHP Anthony DeSclafani, RHP Justin Topa, OF Gabriel Gonzalez, RHP Darren Bowen and cash. |
| 01/29/24 | Minnesota Twins traded SS Jorge Polanco to Seattle Mariners for RHP Anthony DeSclafani, RHP Justin Topa, OF Gabriel Gonzalez, RHP Darren Bowen and cash. |
| 01/29/24 | Minnesota Twins traded SS Jorge Polanco to Seattle Mariners for RHP Anthony DeSclafani, RHP Justin Topa, OF Gabriel Gonzalez, RHP Darren Bowen and cash. |
| 01/23/24 | Seattle Mariners signed free agent LHP Garrett Davila to a minor league contract. |
| 01/23/24 | Seattle Mariners signed free agent SS Morgan McCullough to a minor league contract. |
| 01/23/24 | Seattle Mariners signed free agent LHP Jack White to a minor league contract. |
| 01/22/24 | Seattle Mariners signed free agent C Michael Papierski to a minor league contract. |
| 01/20/24 | Seattle Mariners signed free agent RHP Gregori Arrieche to a minor league contract. |
| 01/20/24 | Seattle Mariners released 2B Joshua Francis. |
| 01/20/24 | Seattle Mariners released RHP Lisander Brito. |
| 01/19/24 | Seattle Mariners signed free agent RHP Eduardo Uscanga to a minor league contract. |
| 01/19/24 | Seattle Mariners signed free agent C Eduardo Ponce to a minor league contract. |
| 01/18/24 | Seattle Mariners signed free agent 2B Michael Chavis to a minor league contract. |
| 01/18/24 | Seattle Mariners signed free agent RHP Sean Poppen to a minor league contract. |
| 01/18/24 | Seattle Mariners signed free agent RHP Ty Buttrey to a minor league contract. |
| 01/17/24 | Seattle Mariners activated RHP Austin Voth. |
| 01/17/24 | Seattle Mariners signed free agent RHP Austin Voth. |
| 01/15/24 | Seattle Mariners activated LF Cade Marlowe. |
| 01/15/24 | Seattle Mariners signed free agent SS Leandro Romero to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent RHP David Pena to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent 3B Zeus Nunez to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent 2B Joshua Francis to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent OF Manuel De Cesare to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent C Gabriel Guanchez to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent RHP Carlos Jaspe to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent RHP Jheifer Ramirez to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent SS Dawel Joseph to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent LHP Eliezer Orbe to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent RHP Anderson Jimenez to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent SS Deuri Castillo to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent C Manuel Baez to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent RHP Cristian Aray to a minor league contract. |
| 01/15/24 | Seattle Mariners signed free agent RHP Erick Lanza to a minor league contract. |
| 01/10/24 | Seattle Mariners activated RHP Mauricio Llovera. |
| 01/10/24 | Seattle Mariners claimed RHP Mauricio Llovera off waivers from Boston Red Sox. |
| 01/05/24 | Seattle Mariners traded LHP Robbie Ray to San Francisco Giants for RF Mitch Haniger, RHP Anthony DeSclafani and cash. |
| 01/05/24 | Seattle Mariners traded LHP Robbie Ray to San Francisco Giants for RF Mitch Haniger, RHP Anthony DeSclafani and cash. |
| 01/05/24 | Seattle Mariners traded LHP Robbie Ray to San Francisco Giants for RF Mitch Haniger, RHP Anthony DeSclafani and cash. |
| 01/05/24 | Tampa Bay Rays traded LF Luke Raley to Seattle Mariners for SS José Caballero. |
| 01/05/24 | Tampa Bay Rays traded LF Luke Raley to Seattle Mariners for SS José Caballero. |