Michael Gregory Marjama
- Bats Right, Throws Right
- Height 6' 2", Weight 205 lb.
- School California State University, Long Beach
- High School Granite Bay High School
- Debut September 3, 2017
- Final Game April 18, 2018
- Born July 20, 1989 in Roseville, CA USA
Mike Marjama retired from baseball on July 6, 2018 at the age of 28 to accept a position with the National Eating Disorders Association. Marjama has suffered from anorexia, which was triggered by trying to cut weight for his high school wrestling team.
He had applied for reinstatement in 2019. However, before Commissioner Rob Manfred could consider this application, Marjama was suspended for 80 games for testing positive for performance enhancing drugs. The failed test and suspension was announced on May 2.