Mariners Roster & Staff
Transactions
| Date | Transaction |
| 01/29/19 | Seattle Mariners signed free agent LHP Eliezer Mejia to a minor league contract. |
| 01/27/19 | Seattle Mariners designated Max Povse for assignment. |
| 01/27/19 | Seattle Mariners signed RHP Hunter Strickland. |
| 01/24/19 | Seattle Mariners invited non-roster 1B Evan White to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster RHP David McKay to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster OF Eric Filia to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster OF Kyle Lewis to spring training. |
| 01/24/19 | Seattle Mariners signed free agent OF Tito Polo to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent SS Orlando Calixte to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent 2B Dustin Ackley to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent C Austin Nola to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent C Jose Lobaton to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent LHP Tommy Milone to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent RF Ichiro Suzuki to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent RHP Jorgan Cavanerio to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent RHP Nabil Crismatt to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent RHP Robin Leyer to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent RHP Tyler Danish to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners signed free agent RHP Tayler Scott to a minor league contract and invited him to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster C Dean Nevarez to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster RHP Jack Anderson to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster RHP Ryan Garton to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster LHP Matt Tenuta to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster C Joe DeCarlo to spring training. |
| 01/24/19 | Seattle Mariners invited non-roster C Cal Raleigh to spring training. |
| 01/24/19 | Seattle Mariners signed free agent 2B Tim Lopes to a minor league contract and invited him to spring training. |
| 01/24/19 | Detroit Tigers claimed 3B Kaleb Cowart off waivers from Seattle Mariners. |
| 01/24/19 | RHP Tayler Scott roster status changed by Seattle Mariners. |
| 01/23/19 | Marco Gonzales changed number to 7. |
| 01/23/19 | P Marco Gonzales changed number to 42. |
| 01/23/19 | P Marco Gonzales changed number to 7. |
| 01/23/19 | P Marco Gonzales changed number to 42. |
| 01/23/19 | LHP Marco Gonzales changed number to 7. |
| 01/21/19 | Seattle Mariners traded OF Josh Stowers to New York Yankees for 2B Shed Long. |
| 01/21/19 | Seattle Mariners traded OF Josh Stowers to New York Yankees for 2B Shed Long. |
| 01/21/19 | Seattle Mariners designated 3B Kaleb Cowart for assignment. |
| 01/15/19 | Texas Rangers claimed RF John Andreoli off waivers from Seattle Mariners. |
| 01/10/19 | Seattle Mariners signed free agent RHP Cory Gearrin. |
| 01/10/19 | Seattle Mariners signed free agent SS Tim Beckham. |
| 01/10/19 | Seattle Mariners designated RF John Andreoli for assignment. |
| 01/02/19 | Seattle Mariners signed free agent P Yusei Kikuchi. |
| 01/02/19 | Seattle Mariners signed free agent LHP Yusei Kikuchi. |
| 01/02/19 | Seattle Mariners signed free agent LHP Yusei Kikuchi. |
| 01/02/19 | Seattle Mariners signed free agent P Yusei Kikuchi. |
| 01/02/19 | Seattle Mariners signed free agent P Yusei Kikuchi. |
| 01/02/19 | Seattle Mariners signed free agent RHP Aaron Northcraft to a minor league contract. |