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 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