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

• 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

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