Therion, Greek for "wild animal" or "beast" (θηρίον), may refer to:
- Therion, the name the Greeks gave to Lupus (constellation) ("wolf")
- Therion (band), a Swedish metal band
- Therion (Thelema), a god in Thelema, consort of Babalon
- Therion (software), a cave cartography programme.
- Master Therion or To Mega Therion, a title assumed by Aleister Crowley
- The Beast (Revelation), a monster from the Book of Revelation