List of people known as the Cruel

The epithet the Cruel has been applied to the following:

People:
 * Boleslaus I, Duke of Bohemia (died 967 or 972)
 * Fruela I of Asturias (died 768), King of Asturias
 * Peter of Castile (1334–1369), King of Castile and León

Fictional characters:
 * Gorthaur the Cruel, another name for Sauron, villain of The Lord of the Rings
 * Kalibak, a DC Comics deity and supervillain
 * Kiber the Cruel, a Marvel Comics supervillain
 * Maegor the Cruel, a villainous king from the fantasy novel Fire & Blood
 * Slagar the Cruel, a villain from the children's novel Mattimeo