Red King

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