Mariners Roster & Staff
Transactions
| Date | Transaction |
| 04/29/17 | Seattle Mariners placed RHP Evan Scribner on the 10-day disabled list retroactive to April 26, 2017. Flexor bundle strain. |
| 04/29/17 | Seattle Mariners recalled Boog Powell from Tacoma Rainiers. |
| 04/27/17 | Seattle Mariners reassigned RHP Rob Whalen to the minor leagues. |
| 04/27/17 | Seattle Mariners optioned RHP Rob Whalen to Tacoma Rainiers. |
| 04/27/17 | Seattle Mariners sent CF Leonys Martin outright to Tacoma Rainiers. |
| 04/26/17 | Seattle Mariners placed RHP Felix Hernandez on the 10-day disabled list. Right shoulder inflammation. |
| 04/26/17 | Seattle Mariners recalled Dillon Overton from Tacoma Rainiers. |
| 04/26/17 | Seattle Mariners optioned RHP Evan Marshall to Tacoma Rainiers. |
| 04/26/17 | Seattle Mariners optioned RHP Chris Heston to Tacoma Rainiers. |
| 04/26/17 | Seattle Mariners recalled LF Ben Gamel from Tacoma Rainiers. |
| 04/26/17 | Seattle Mariners selected the contract of RHP Casey Fien from Tacoma Rainiers. |
| 04/26/17 | Seattle Mariners placed RF Mitch Haniger on the 10-day disabled list. Strained right oblique. |
| 04/26/17 | Seattle Mariners recalled Chase De Jong from Tacoma Rainiers. |
| 04/25/17 | Seattle Mariners activated SS Jean Segura from the 10-day disabled list. |
| 04/24/17 | Seattle Mariners optioned 2B Mike Freeman to Tacoma Rainiers. |
| 04/23/17 | Seattle Mariners optioned RHP Chase De Jong to Tacoma Rainiers. |
| 04/23/17 | Seattle Mariners recalled Daniel Vogelbach from Tacoma Rainiers. |
| 04/23/17 | Seattle Mariners recalled Chris Heston from Tacoma Rainiers. |
| 04/23/17 | Seattle Mariners designated CF Leonys Martin for assignment. |
| 04/23/17 | Seattle Mariners sent RHP Steve Cishek on a rehab assignment to Arkansas Travelers. |
| 04/21/17 | Seattle Mariners sent SS Jean Segura on a rehab assignment to Arkansas Travelers. |
| 04/21/17 | Seattle Mariners optioned RHP Dan Altavilla to Tacoma Rainiers. |
| 04/21/17 | Seattle Mariners signed free agent RHP Juan Mercedes to a minor league contract. |
| 04/21/17 | Seattle Mariners recalled Chase De Jong from Tacoma Rainiers. |
| 04/21/17 | Seattle Mariners signed free agent RHP Jesus Ozoria to a minor league contract. |
| 04/18/17 | Seattle Mariners sent RHP Steve Cishek on a rehab assignment to Tacoma Rainiers. |
| 04/17/17 | Seattle Mariners sent RHP Steve Cishek on a rehab assignment to Arkansas Travelers. |
| 04/17/17 | Seattle Mariners signed free agent 2B Nelson Ward to a minor league contract. |
| 04/17/17 | Seattle Mariners sent RHP Steve Cishek on a rehab assignment to Arkansas Travelers. |
| 04/14/17 | Seattle Mariners traded LHP Paul Fry to Baltimore Orioles for Future Considerations. |
| 04/14/17 | Seattle Mariners activated RHP Tony Zych from the 10-day disabled list. |
| 04/14/17 | Seattle Mariners optioned LHP Dillon Overton to Tacoma Rainiers. |
| 04/12/17 | Seattle Mariners recalled Evan Marshall from Tacoma Rainiers. |
| 04/12/17 | Seattle Mariners sent RHP Casey Fien outright to Tacoma Rainiers. |
| 04/12/17 | Seattle Mariners optioned CF Boog Powell to Tacoma Rainiers. |
| 04/11/17 | Seattle Mariners selected the contract of Mike Freeman from Tacoma Rainiers. |
| 04/11/17 | Seattle Mariners placed SS Jean Segura on the 10-day disabled list. Strained right hamstring. |
| 04/11/17 | Seattle Mariners designated LHP Paul Fry for assignment. |
| 04/09/17 | Seattle Mariners optioned RHP Chase De Jong to Tacoma Rainiers. |
| 04/06/17 | Seattle Mariners optioned RHP Chase De Jong to Tacoma Rainiers. |
| 04/06/17 | Dillon Overton roster status changed by Seattle Mariners. |
| 04/04/17 | Seattle Mariners claimed RHP Evan Marshall off waivers from Arizona Diamondbacks. |
| 04/04/17 | Seattle Mariners optioned RHP Evan Marshall to Tacoma Rainiers. |
| 04/04/17 | Seattle Mariners transferred LHP Drew Smyly from the 10-day disabled list to the 60-day disabled list. Left arm flexor strain. |
| 04/03/17 | Seattle Mariners placed LHP Dillon Overton on the paternity list. |
| 04/03/17 | Seattle Mariners recalled Chase De Jong from Tacoma Rainiers. |
| 04/01/17 | 3B Brock Hebert assigned to Seattle Mariners. |
| 04/01/17 | Seattle Mariners sent RHP Tony Zych on a rehab assignment to Tacoma Rainiers. |
| 04/01/17 | CF Austin Grebeck assigned to Seattle Mariners. |
| 04/01/17 | 2B Gordon Beckham assigned to Seattle Mariners. |
| 04/01/17 | Seattle Mariners signed free agent RHP Mark Lowe to a minor league contract. |
| 04/01/17 | Seattle Mariners signed free agent LHP Freiquik Sanchez to a minor league contract. |
| 04/01/17 | Seattle Mariners signed free agent RHP Kelvin Nunez to a minor league contract. |