Mariners Roster & Staff
Transactions
| Date | Transaction |
| 09/15/23 | Seattle Mariners activated C Brian O'Keefe from the paternity list. |
| 09/15/23 | Seattle Mariners optioned C Brian O'Keefe to Tacoma Rainiers. |
| 09/12/23 | Seattle Mariners placed C Brian O'Keefe on the paternity list. |
| 09/12/23 | New York Yankees claimed RHP Luke Weaver off waivers from Seattle Mariners. |
| 09/12/23 | Seattle Mariners selected the contract of C Luis Torrens from Tacoma Rainiers. |
| 09/11/23 | Seattle Mariners activated OF Jarred Kelenic from the 10-day injured list. |
| 09/11/23 | Seattle Mariners optioned LF Cade Marlowe to Tacoma Rainiers. |
| 09/10/23 | Seattle Mariners designated RHP Luke Weaver for assignment. |
| 09/10/23 | Seattle Mariners recalled RHP Eduard Bazardo from Tacoma Rainiers. |
| 09/02/23 | Oakland Athletics claimed RHP Devin Sweet off waivers from Seattle Mariners. |
| 09/01/23 | RHP Devin Sweet roster status changed by Seattle Mariners. |
| 09/01/23 | Seattle Mariners activated RHP Dominic Leone. |
| 09/01/23 | Seattle Mariners recalled 2B Sam Haggerty from Tacoma Rainiers. |