Mariners Roster & Staff
Transactions
| Date | Transaction |
| 08/31/24 | Seattle Mariners designated SS Terrin Vavra for assignment. |
| 08/31/24 | Seattle Mariners optioned LHP Gabe Speier to Tacoma Rainiers. |
| 08/31/24 | Seattle Mariners selected the contract of 3B Luis Urías from Tacoma Rainiers. |
| 08/28/24 | Seattle Mariners activated SS J.P. Crawford from the 10-day injured list. |
| 08/28/24 | Seattle Mariners optioned RF Dominic Canzone to Tacoma Rainiers. |
| 08/26/24 | New York Yankees claimed OF Duke Ellis off waivers from Seattle Mariners. |
| 08/24/24 | Seattle Mariners sent SS J.P. Crawford on a rehab assignment to Tacoma Rainiers. |
| 08/23/24 | Seattle Mariners designated OF Duke Ellis for assignment. |
| 08/23/24 | Seattle Mariners placed RHP Yimi García on the 15-day injured list retroactive to August 20, 2024. Right elbow inflammation. |
| 08/23/24 | Seattle Mariners claimed SS Terrin Vavra off waivers from Baltimore Orioles. |
| 08/23/24 | Seattle Mariners recalled LHP Gabe Speier from Tacoma Rainiers. |
| 08/23/24 | Seattle Mariners optioned SS Terrin Vavra to Tacoma Rainiers. |
| 08/11/24 | Seattle Mariners activated OF Julio Rodríguez from the 10-day injured list. |
| 08/11/24 | Seattle Mariners optioned SS Ryan Bliss to Tacoma Rainiers. |
| 08/11/24 | Seattle Mariners sent RHP Jonathan Hernández outright to Tacoma Rainiers. |
| 08/10/24 | Seattle Mariners optioned RHP Eduard Bazardo to Tacoma Rainiers. |
| 08/10/24 | Seattle Mariners selected the contract of RHP Troy Taylor from Arkansas Travelers. |
| 08/08/24 | Seattle Mariners signed free agent RHP Nick Payero to a minor league contract. |
| 08/08/24 | Seattle Mariners designated RHP Jonathan Hernández for assignment. |
| 08/08/24 | Seattle Mariners activated RF Dominic Canzone from the 10-day injured list. |
| 08/08/24 | Seattle Mariners optioned 3B Jason Vosler to Tacoma Rainiers. |
| 08/08/24 | Seattle Mariners recalled RHP Eduard Bazardo from Tacoma Rainiers. |
| 08/07/24 | Seattle Mariners optioned LF Cade Marlowe to Tacoma Rainiers. |
| 08/07/24 | Seattle Mariners recalled SS Ryan Bliss from Tacoma Rainiers. |
| 08/06/24 | Seattle Mariners signed free agent LHP Josh Fleming to a minor league contract. |
| 08/05/24 | Miami Marlins claimed RHP Brett de Geus off waivers from Seattle Mariners. |
| 08/03/24 | Seattle Mariners activated RHP Jonathan Hernández. |
| 08/03/24 | Seattle Mariners optioned LHP Jhonathan Diaz to Tacoma Rainiers. |
| 08/02/24 | Seattle Mariners designated RHP Brett de Geus for assignment. |
| 08/02/24 | Seattle Mariners placed RHP Gregory Santos on the 15-day injured list retroactive to August 1, 2024. Right biceps inflammation. |
| 08/02/24 | Seattle Mariners activated RHP JT Chargois. |
| 08/02/24 | Seattle Mariners claimed RHP Jonathan Hernández off waivers from Texas Rangers. |
| 08/01/24 | Seattle Mariners sent RF Dominic Canzone on a rehab assignment to Tacoma Rainiers. |
| 08/01/24 | Seattle Mariners signed free agent C Matthew Ellis to a minor league contract. |