An extremist is a proponent of extremism.
Extremist may also refer to:
- Political fringe movements
- The Extremists (professional wrestling), a professional wrestling tag team
- Extremists (comics), a team of supervillains in DC Comics Justice League titles
- The Extremist (comics), a four-issue comic book mini-series
- Extremist (album), Demon Hunter album
- The Extremist, Joe Satriani album and title track