Ronald Perlman is an American actor. His credits include the roles of Amoukar in Quest for Fire, Salvatore in The Name of the Rose, Vincent in the television series Beauty and the Beast, for which he won a Golden Globe Award, and One in The City of Lost Children, Johner in Alien Resurrection, Hellboy in both Hellboy and its sequel Hellboy II: The Golden Army, Clay Morrow on the television series Sons of Anarchy, and Nino in Drive.

Perlman is also known as a collaborator of Hellboy director Guillermo del Toro, having roles in the del Toro films Cronos Blade II, Pacific Rim, and Nightmare Alley. His voice-over work includes the narrator of the post-apocalyptic game series Fallout, Clayface in the DC Animated Universe, Slade in Teen Titans, Mr. Lancer in Danny Phantom, Lord Hood in the video games Halo 2 and Halo 3, the Stabbington brothers in Tangled, The Lich in Adventure Time, Xibalba in The Book of Life and Optimus Primal in both Transformers: Power of the Primes and the forthcoming Transformers: Rise of the Beasts.