Stephen J. Matthias
- Bats Right, Throws Right
- Height 5' 8", Weight 160 lb.
- Debut April 20, 1884
- Final Game June 27, 1884
- Born 1860 in Mitchellville, MD USA
- Died July 29, 1891 in Baltimore, MD USA
Steve Matthias played one season in the Union Association in 1884 for the team that started in Chicago and went to Pittsburgh. Steve was with them in Chicago. The starting shortstop, he hit .275 on a team that hit .231. He died when he was around 31 years old.