Casey Olson is a retired American mixed martial arts fighter.
Olson attended Clovis High School, where he was a two-time captain of the wrestling team.
After two seasons, Olson transferred to Fresno State University where he was a two-time NCAA Qualifier and Northern Regional Champion.
Olson made his promotional debut at Strikeforce: Tank vs. Buentello, against Bobby Sanchez.
Olson won via first-round submission, but would go 6-3 on the regional circuit before returning to face Chris Culley at Strikeforce Challengers: Gurgel vs. Evangelista in 2009.