Demon King
Demon King may refer to:
- The Demon King (album), a 2014 release by Demonic Resurrection
 - Demon King (Doraemon), a character in the film Doraemon: Nobita's New Great Adventure into the Underworld
 - Demon King of Chaos, a character in Water Margin, one of the Four Great Classical Novels of Chinese literature
 - Demon King Chestra, a character in the fantasy adventure manga Violinist of Hameln
 - Demon King of Confusion, a character in the Chinese classical novel Journey to the West
 - Demon King Daimao, a Japanese light novel series
 - Great Demon King Koopa, the main antagonist of Nintendo's Mario franchise, known as Bowser in English media
 - Ganondorf, also known as the Demon King, the main antagonist of Nintendo’s Legend of Zelda franchise
 - Demon King Piccolo, a character in the Dragon Ball manga series
 - Ox-Demon-King, a character in the 16th century Chinese novel Journey to the West
 - Diary of a Demon King, a manhwa (Korean comic)
 - Rage of a Demon King, a 1997 novel by Raymond E. Feist
 - Oda Nobunaga (1534–1582), Japanese samurai and warlord
 
See also
- Agaliarept, a demon king in two 1980s computer games by Level 9 Computing in their Middle Earth trilogy
 - Balor, a character in Irish mythology
 - Dark Lord, a powerful villain or antagonist with evil henchmen
 - Demon Lord (disambiguation)
 - Finn Bálor, nicknamed the “Demon King” in WWE
 - Fomortiis, a character described as a demon king in the Game Boy Advance game Fire Emblem: The Sacred Stones
 - King Banasura, a demon king said to have ruled over Banapur, Odisha State, India
 - Prince of Darkness
 - Ravana of Lanka, a demon king in the Hindu epic Ramayana
 - Satan