Mariners Roster & Staff
Transactions
| Date | Transaction |
| 01/31/17 | Seattle Mariners signed free agent LHP Nick Hagadone to a minor league contract and invited him to spring training. |
| 01/30/17 | Seattle Mariners invited non-roster C Sebastian Valle to spring training. |
| 01/30/17 | Seattle Mariners invited non-roster RHP Dylan Unsworth to spring training. |
| 01/30/17 | Seattle Mariners invited non-roster RHP Andrew Moore to spring training. |
| 01/30/17 | Seattle Mariners invited non-roster C Tyler Marlette to spring training. |
| 01/30/17 | Seattle Mariners invited non-roster OF Tyler O'Neill to spring training. |
| 01/30/17 | Seattle Mariners invited non-roster 2B Tyler Smith to spring training. |
| 01/30/17 | Seattle Mariners invited non-roster C Marcus Littlewood to spring training. |
| 01/26/17 | Oakland Athletics traded LHP Dillon Overton to Seattle Mariners for C Jason Goldstein. |
| 01/26/17 | Oakland Athletics traded LHP Dillon Overton to Seattle Mariners for C Jason Goldstein. |
| 01/26/17 | Seattle Mariners designated Jesus Sucre for assignment. |
| 01/26/17 | Seattle Mariners designated RHP Jonathan Aro for assignment. |
| 01/26/17 | Seattle Mariners claimed Tuffy Gosewisch off waivers from Atlanta Braves. |
| 01/22/17 | Seattle Mariners signed free agent RHP Jean Machi to a minor league contract and invited him to spring training. |
| 01/13/17 | Seattle Mariners sent RHP Cody Martin outright to Tacoma Rainiers. |
| 01/11/17 | Tampa Bay Rays traded LHP Drew Smyly to Seattle Mariners for SS Carlos Vargas, CF Mallex Smith and LHP Ryan Yarbrough. |
| 01/11/17 | Tampa Bay Rays traded LHP Drew Smyly to Seattle Mariners for SS Carlos Vargas, CF Mallex Smith and LHP Ryan Yarbrough. |
| 01/11/17 | Seattle Mariners designated Cody Martin for assignment. |
| 01/11/17 | Atlanta Braves traded CF Mallex Smith and RHP Shae Simmons to Seattle Mariners for LHP Luiz Gohara and LHP Thomas Burrows. |
| 01/11/17 | LF Willie Argo roster status changed by Seattle Mariners. |
| 01/11/17 | Atlanta Braves traded CF Mallex Smith and RHP Shae Simmons to Seattle Mariners for LHP Luiz Gohara and LHP Thomas Burrows. |
| 01/11/17 | Atlanta Braves traded CF Mallex Smith and RHP Shae Simmons to Seattle Mariners for LHP Luiz Gohara and LHP Thomas Burrows. |
| 01/11/17 | Atlanta Braves traded CF Mallex Smith and RHP Shae Simmons to Seattle Mariners for LHP Luiz Gohara and LHP Thomas Burrows. |
| 01/11/17 | Tampa Bay Rays traded LHP Drew Smyly to Seattle Mariners for SS Carlos Vargas, CF Mallex Smith and LHP Ryan Yarbrough. |
| 01/11/17 | Seattle Mariners signed free agent LF Willie Argo to a minor league contract. |
| 01/11/17 | Tampa Bay Rays traded LHP Drew Smyly to Seattle Mariners for SS Carlos Vargas, CF Mallex Smith and LHP Ryan Yarbrough. |
| 01/06/17 | Seattle Mariners traded RHP Nate Karns to Kansas City Royals for LF Jarrod Dyson. |
| 01/06/17 | Seattle Mariners traded RHP Nate Karns to Kansas City Royals for LF Jarrod Dyson. |
| 01/06/17 | Seattle Mariners traded RF Seth Smith to Baltimore Orioles for RHP Yovani Gallardo and cash. |
| 01/06/17 | Seattle Mariners traded RF Seth Smith to Baltimore Orioles for RHP Yovani Gallardo and cash. |