Casey Michael Fien
- Bats Right , Throws Right
- Height 6' 2" , Weight 195 lb.
- School William Penn College, Golden West College, California State Polytechnic University, San Luis Obispo
- High School John F. Kennedy High School (La Palma)
- Debut July 26, 2009
- Final Game June 20, 2017
- Born October 21, 1983 in Santa Rosa, CA USA
Casey Fien was a starter for NAIA William Penn College as a freshman, then returned to his homestate to pitch at Golden West College as a sophomore. He then moved up to D-I Cal Poly-SLO as a junior and senior. Fien was taken by the Detroit Tigers in the 20th round of the 2006 amateur draft. Signed by scout Tim McWilliam, he made his pro debut with the Oneonta Tigers that summer.