Mariners Roster & Staff
Transactions
| Date | Transaction |
| 04/30/11 | RHP Steve Delabar assigned to Seattle Mariners. |
| 04/26/11 | Seattle Mariners signed free agent RHP Eduardo Miliani to a minor league contract. |
| 04/25/11 | Seattle Mariners activated 1B Justin Smoak from the bereavement list. |
| 04/25/11 | Seattle Mariners optioned Carlos Peguero to Tacoma Rainiers. |
| 04/25/11 | Seattle Mariners optioned Josh Lueke to Tacoma Rainiers. |
| 04/25/11 | Seattle Mariners recalled Dan Cortes from Tacoma Rainiers. |
| 04/21/11 | Seattle Mariners optioned 1B Matt Mangini to Tacoma Rainiers. |
| 04/19/11 | Seattle Mariners placed 1B Justin Smoak on the bereavement list. |
| 04/19/11 | Seattle Mariners recalled Carlos Peguero from Tacoma Rainiers. |
| 04/15/11 | Seattle Mariners signed free agent OF Angel Salome to a minor league contract. |
| 04/08/11 | Seattle Mariners placed C Adam Moore on the 60-day disabled list retroactive to April 7, 2011. Torn medial meniscus in his right knee. |
| 04/08/11 | Seattle Mariners selected the contract of C Chris Gimenez from Tacoma Rainiers. |
| 04/06/11 | RHP Denny Bautista assigned to Tacoma Rainiers from Seattle Mariners. |
| 04/06/11 | LHP Royce Ring assigned to Tacoma Rainiers from Seattle Mariners. |