Mariners Roster & Staff
Transactions
| Date | Transaction |
| 11/27/23 | Miami Marlins claimed RHP Ryan Jensen off waivers from Seattle Mariners. |
| 11/22/23 | Seattle Mariners designated RHP Ryan Jensen for assignment. |
| 11/22/23 | Seattle Mariners traded 3B Eugenio Suárez to Arizona Diamondbacks for RHP Carlos Vargas and C Seby Zavala. |
| 11/22/23 | Seattle Mariners traded 3B Eugenio Suárez to Arizona Diamondbacks for RHP Carlos Vargas and C Seby Zavala. |
| 11/22/23 | Seattle Mariners traded 3B Eugenio Suárez to Arizona Diamondbacks for RHP Carlos Vargas and C Seby Zavala. |
| 11/17/23 | 1B Mike Ford elected free agency. |
| 11/17/23 | Boston Red Sox traded 3B Luis Urías to Seattle Mariners for RHP Isaiah Campbell. |
| 11/17/23 | Boston Red Sox traded 3B Luis Urías to Seattle Mariners for RHP Isaiah Campbell. |
| 11/16/23 | Seattle Mariners signed free agent 1B Rangel Ravelo to a minor league contract. |
| 11/14/23 | Seattle Mariners activated OF Zach DeLoach. |
| 11/14/23 | Seattle Mariners designated 1B Mike Ford for assignment. |
| 11/14/23 | Seattle Mariners selected the contract of OF Zach DeLoach from Tacoma Rainiers. |
| 11/13/23 | Seattle Mariners signed free agent RHP Nick Davila to a minor league contract. |
| 11/06/23 | Seattle Mariners activated 1B Evan White from the 60-day injured list. |
| 11/06/23 | Seattle Mariners activated RHP Emerson Hancock from the 60-day injured list. |
| 11/06/23 | Seattle Mariners activated LHP Robbie Ray from the 60-day injured list. |
| 11/06/23 | Seattle Mariners activated LHP Marco Gonzales from the 60-day injured list. |
| 11/06/23 | Seattle Mariners activated C Blake Hunt. |
| 11/06/23 | Tampa Bay Rays traded C Blake Hunt to Seattle Mariners for C Tatem Levins. |
| 11/06/23 | Seattle Mariners sent RHP Ryder Ryan outright to Tacoma Rainiers. |
| 11/06/23 | Tampa Bay Rays traded C Blake Hunt to Seattle Mariners for C Tatem Levins. |
| 11/05/23 | Seattle Mariners traded RHP Riley O'Brien to St. Louis Cardinals for cash. |
| 11/02/23 | Seattle Mariners signed free agent RHP Tyson Miller to a minor league contract. |
| 11/02/23 | RHP Dominic Leone elected free agency. |
| 11/02/23 | C Tom Murphy elected free agency. |
| 11/02/23 | Seattle Mariners activated RHP Cody Bolton. |
| 11/02/23 | LF Teoscar Hernández elected free agency. |
| 11/02/23 | Pittsburgh Pirates traded RHP Cody Bolton to Seattle Mariners for cash. |