Apollyon (Ἀπολλύων) is the Greek name for Abaddon, the spiritual being (or place) named as the destroyer (or place of destruction), the exterminator, in Christian apocalyptic theology.
Apollyon or Appolyon may also refer to:
Literature Apollyon (novel), a novel in the Left Behind sequence, by Tim LaHaye and Jerry B. Jenkins Apollyon, a demon appearing in The Pilgrim's Progress by John Bunyan Apollyon Pringle, a character in the Harry Potter series
Comics Apollyon, an incarnation of the Marvel Comics character Fantomex in the X-Men storyline Here Comes Tomorrow Appolyon (CrossGen), a comic book character in the Sigilverse created by CrossGen Entertainment
Music Apollyon (musician), Ole Moe, a black metal multi-instrumentalist Apollyon, a 1996 album by Thou Art Lord, a Hellenic-Black Metal supergroup
Video Games Apollyon, a character in the 2017 game For Honor Apollyon, a character in the Afterbirth+ expansion for the 2014 game The Binding of Isaac: Rebirth
Other Apollyon, a classification for potentially world-destroying and uncontainable SCP objects in the fictional SCP Foundation universe