Mariners Roster & Staff
Transactions
| Date | Transaction |
| 04/26/15 | Seattle Mariners recalled Roenis Elias from Tacoma Rainiers. |
| 04/26/15 | Seattle Mariners optioned LHP Lucas Luetge to Tacoma Rainiers. |
| 04/24/15 | Seattle Mariners recalled Lucas Luetge from Tacoma Rainiers. |
| 04/24/15 | Seattle Mariners placed RHP Hisashi Iwakuma on the 15-day disabled list retroactive to April 21, 2014. Right Lat Strain |
| 04/22/15 | Seattle Mariners signed free agent LF Carlos Quentin to a minor league contract. |
| 04/18/15 | Seattle Mariners optioned SS Chris Taylor to Tacoma Rainiers. |
| 04/13/15 | Seattle Mariners placed RHP Tom Wilhelmsen on the 15-day disabled list retroactive to April 11, 2015. Hyperextended right elbow |
| 04/13/15 | Seattle Mariners recalled Dominic Leone from Tacoma Rainiers. |
| 04/11/15 | Seattle Mariners sent SS Chris Taylor on a rehab assignment to Tacoma Rainiers. |
| 04/09/15 | Seattle Mariners signed free agent RHP Pedro Vasquez to a minor league contract. |
| 04/06/15 | Seattle Mariners signed free agent LHP Joe Saunders to a minor league contract. |
| 04/04/15 | Seattle Mariners selected the contract of LHP Tyler Olson from Jackson Generals. |
| 04/04/15 | Chris Taylor roster status changed by Seattle Mariners. |
| 04/04/15 | LHP James Gillheeney assigned to Seattle Mariners. |
| 04/03/15 | Seattle Mariners optioned RHP Dominic Leone to Tacoma Rainiers. |
| 04/03/15 | Seattle Mariners recalled RHP Carson Smith from Tacoma Rainiers. |
| 04/03/15 | RHP Rafael Pineda assigned to Seattle Mariners. |
| 04/03/15 | Edgar Olmos roster status changed by Seattle Mariners. |
| 04/03/15 | Seattle Mariners optioned LHP Mike Montgomery to Tacoma Rainiers. |
| 04/02/15 | Seattle Mariners signed free agent LHP Joe Beimel to a minor league contract. |
| 04/02/15 | Chicago Cubs traded RHP Tony Zych to Seattle Mariners for Player To Be Named Later. |
| 04/01/15 | 3B Luis Caballero assigned to Seattle Mariners. |