The Shadow King (Amahl Farouk) is a supervillain appearing in American comic books published by Marvel Comics. The character is particularly associated with the X-Men family of comics. His nemesis is the X-Men's leader, Professor X, while he also figures into the backstory of the X-Man Storm. As originally introduced, Farouk was a human mutant from Egypt who used his vast telepathic abilities for evil, taking the alias Shadow King. Later writers established Farouk as only the modern incarnation of an ancient evil entity that has been around since the dawn of humanity, who became one with Farouk when he grew older.

The character has appeared in various adaptations of X-Men stories, including X-Men: The Animated Series and Wolverine and the X-Men.

Farouk made his live-action debut in the television series Legion, portrayed by Aubrey Plaza and Navid Negahban, where he was the show's primary antagonist.