Mariners Roster & Staff
Transactions
| Date | Transaction |
| 07/31/16 | Seattle Mariners optioned LHP Ariel Miranda to Tacoma Rainiers. |
| 07/31/16 | Seattle Mariners traded LHP Wade Miley to Baltimore Orioles for LHP Ariel Miranda. |
| 07/31/16 | Seattle Mariners traded LHP Wade Miley to Baltimore Orioles for LHP Ariel Miranda. |
| 07/30/16 | Seattle Mariners recalled Cody Martin from Tacoma Rainiers. |
| 07/30/16 | Seattle Mariners placed RHP Nathan Karns on the 15-day disabled list. Low back strain. |
| 07/29/16 | Seattle Mariners optioned LHP David Rollins to Tacoma Rainiers. |
| 07/29/16 | Seattle Mariners recalled Guillermo Heredia from Tacoma Rainiers. |
| 07/26/16 | Toronto Blue Jays traded RHP Drew Storen and cash to Seattle Mariners for RHP Joaquin Benoit. |
| 07/26/16 | Toronto Blue Jays traded RHP Drew Storen and cash to Seattle Mariners for RHP Joaquin Benoit. |
| 07/25/16 | Seattle Mariners signed free agent RHP Dillon Moyer to a minor league contract. |
| 07/23/16 | Seattle Mariners placed SS Ketel Marte on the 15-day disabled list retroactive to July 20, 2016. Mononucleosis. |
| 07/23/16 | Seattle Mariners recalled David Rollins from Tacoma Rainiers. |
| 07/22/16 | Seattle Mariners recalled Luis Sardinas from Tacoma Rainiers. |
| 07/21/16 | Seattle Mariners signed free agent RHP Geovanny Acosta to a minor league contract. |
| 07/20/16 | Seattle Mariners optioned LF Daniel Robertson to Tacoma Rainiers. |
| 07/20/16 | Seattle Mariners optioned LHP David Rollins to Tacoma Rainiers. |
| 07/20/16 | Seattle Mariners optioned C Jesus Sucre to Tacoma Rainiers. |
| 07/20/16 | Seattle Mariners activated RHP Felix Hernandez from the 15-day disabled list. |
| 07/20/16 | Seattle Mariners recalled Norichika Aoki from Tacoma Rainiers. |
| 07/20/16 | Seattle Mariners recalled Mike Zunino from Tacoma Rainiers. |
| 07/20/16 | Seattle Mariners optioned 1B Dan Vogelbach to Tacoma Rainiers. |
| 07/20/16 | Seattle Mariners traded RHP Jordan Pries and LHP Mike Montgomery to Chicago Cubs for 1B Dan Vogelbach and RHP Paul Blackburn. |
| 07/20/16 | Seattle Mariners traded RHP Jordan Pries and LHP Mike Montgomery to Chicago Cubs for 1B Dan Vogelbach and RHP Paul Blackburn. |
| 07/20/16 | Seattle Mariners traded RHP Jordan Pries and LHP Mike Montgomery to Chicago Cubs for 1B Dan Vogelbach and RHP Paul Blackburn. |
| 07/20/16 | Seattle Mariners traded RHP Jordan Pries and LHP Mike Montgomery to Chicago Cubs for 1B Dan Vogelbach and RHP Paul Blackburn. |
| 07/19/16 | Seattle Mariners signed free agent SS Cesar Izturis to a minor league contract. |
| 07/16/16 | Seattle Mariners signed OF Trey Griffey. |
| 07/15/16 | Seattle Mariners sent RHP Felix Hernandez on a rehab assignment to Tacoma Rainiers. |
| 07/14/16 | Seattle Mariners sent LHP Charlie Furbush on a rehab assignment to Tacoma Rainiers. |
| 07/10/16 | Seattle Mariners sent RHP Felix Hernandez on a rehab assignment to Everett AquaSox. |
| 07/10/16 | Seattle Mariners sent RHP Ryan Cook on a rehab assignment to AZL Mariners. |
| 07/10/16 | Seattle Mariners signed free agent OF Luis Veloz to a minor league contract. |
| 07/08/16 | Seattle Mariners sent LHP Charlie Furbush on a rehab assignment to Everett AquaSox. |
| 07/07/16 | Seattle Mariners signed free agent LF Robert Perez to a minor league contract. |
| 07/07/16 | Seattle Mariners signed RHP Nathan Bannister. |
| 07/07/16 | Seattle Mariners signed free agent C Ryan Casteel to a minor league contract. |
| 07/06/16 | Seattle Mariners transferred C Steve Clevenger from the 15-day disabled list to the 60-day disabled list. Fractured third metacarpal in right hand. |
| 07/06/16 | Seattle Mariners transferred C Steve Clevenger from the 15-day disabled list to the 60-day disabled list. Fractured third metacarpal in right hand. |
| 07/06/16 | Jesus Sucre roster status changed by Seattle Mariners. |
| 07/06/16 | Seattle Mariners optioned C Mike Zunino to Tacoma Rainiers. |
| 07/06/16 | Seattle Mariners recalled David Rollins from Tacoma Rainiers. |
| 07/06/16 | Seattle Mariners placed RHP Taijuan Walker on the 15-day disabled list. Right foot tendinitis. |
| 07/05/16 | Seattle Mariners optioned David Rollins to Tacoma Rainiers. |
| 07/05/16 | Seattle Mariners transferred RHP Adrian Sampson from the 15-day disabled list to the 60-day disabled list. Right elbow discomfort. |
| 07/05/16 | Texas Rangers traded OF Ryan Strausborger to Seattle Mariners for Future Considerations. |
| 07/05/16 | Seattle Mariners selected the contract of Daniel Robertson from Tacoma Rainiers. |
| 07/04/16 | Seattle Mariners signed free agent SS Alexander Campos to a minor league contract. |
| 07/03/16 | Seattle Mariners signed free agent RHP Guido Knudson to a minor league contract. |
| 07/02/16 | Seattle Mariners signed free agent RHP Juan Then to a minor league contract. |
| 07/02/16 | Seattle Mariners signed free agent LHP Aronny Cruz to a minor league contract. |
| 07/02/16 | RHP Guido Knudson roster status changed by Seattle Mariners. |
| 07/01/16 | Seattle Mariners signed free agent RHP Kevin Munson to a minor league contract. |
| 07/01/16 | RHP Kevin Munson assigned to Tacoma Rainiers from Seattle Mariners. |