Grey Gargoyle (Paul Pierre Duval) is a supervillain appearing in American comic books published by Marvel Comics. The character was created by Stan Lee and Jack Kirby and first appeared in Journey into Mystery #107 (August 1964). Duval is a French chemist who gave himself the ability to petrify anything via his right hand. Originally appearing as an enemy of Thor, Grey Gargoyle has battled various other heroes throughout his publication history. During the storyline Fear Itself, Grey Gargoyle was temporarily transformed into Mokk, one of the Serpent's Worthy.

The character has made appearances in various media outside comics, including animated series and video games. Chris Wiggins, Ed Gilbert, and Troy Baker voice Grey Gargoyle in The Marvel Super Heroes, Iron Man, and The Avengers: Earth's Mightiest Heroes respectively.

The Grey Gargoyle first appeared in Journey into Mystery #107 (Aug. 1964) and was created by Stan Lee and Jack Kirby.

Paul Pierre Duval is a French chemist whose right hand was transformed into stone following a chemical accident, granting the ability to petrify anything it touches. Duval, however, becomes bored and attempts to achieve immortality by confronting Thor and stealing his hammer, Mjolnir. Thor is turned to stone in their first battle, but turns back to Donald Blake when he falls over and strikes the floor with his hammer. As Blake, he defeats Grey Gargoyle by luring him into the Hudson River in New York City, using a projection of Thor, leaving the villain buried at the bottom. The Grey Gargoyle eventually reappears after being hauled up from the river, whereupon he turns the two people examining him to stone. Believing that Blake can help him find Thor, the Grey Gargoyle goes after him. He pursues them through the streets, becoming angry at their escaping him and finally deciding to eliminate Blake. However he is delayed by an Asgardian blinding him with an arrow that gives off light, after which the Asgardian restores the Thunder God's power. The Grey Gargoyle is incapacitated by Thor once again as he uses his hammer to trap the Grey Gargoyle by tapping a lamppost as a power source and sending a bolt which fuses Grey Gargoyle's limbs. Odin then fully restores Thor's power.

The Grey Gargoyle appears in the title Tales of Suspense, attempting to steal an experimental device for use against Thor, but is stopped by his fellow Avenger Iron Man. The character continues to play the role of industrial saboteur in the title Captain America, attempting to steal an experimental chemical called Element X before being stopped by Captain America; the Falcon and Nick Fury. An appearance in the title Marvel Team-Up against Captain America and fellow hero Spider-Man ends with Grey Gargoyle being trapped in a rocket and launched into deep space.

The character reappears in the title Thor, and is revealed to have been rescued by the crew of the alien spaceship the Bird of Prey and nominated their captain. After a battle with Thor the character is lost in space once again. The Grey Gargoyle eventually returns to Earth in a meteorite in the title Avengers, and battles briefly before being defeated and imprisoned. The character reappears in the title as part of Helmut Zemo's incarnation of the Masters of Evil. In an encounter with the Avenger the Black Knight, Grey Gargoyle grasps the hero's enchanted sword and is reverted to human form, his power temporarily neutralized.

In the title Iron Man, Grey Gargoyle adopts the false identity of sculptor Paul St. Pierre, and intends to make a fortune in the art world by selling persons transformed to stone as authentic sculptures. The ruse, however, is discovered by Iron Man, who defeats the villain.

During the Acts of Vengeance storyline, Doctor Doom hires Grey Gargoyle to battle the Hulk. However, Hulk resists Grey Gargoyle's power and then humiliates him by breaking his arm.