Red King may refer to:
- The red King playing card
- Red King (Ultra monster), a foe of the Japanese superhero Ultraman
- Red King (comics), a number of comics characters of the same name
- William II of England, commonly known as William "Rufus", or "The Red King"
- Rory "Red King" MacDonald, a Canadian MMA fighter
- The Red King (novel), a children's book by author Victor Kelleher
- The Red King (TV series), a 2024 British crime drama television series
- Red King (Through the Looking-Glass), a character in the Lewis Carroll novel Through the Looking-Glass
- An ancient king whose descendants are the main characters in Children of the Red King series of books by Jenny Nimmo
- Another name for the Crimson King from the works of Stephen King
This disambiguation page lists articles associated with the title Red King.
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