Roy William Thomas Jr. (born November 22, 1940) is an American comic book writer and editor, who was Stan Lee's first successor as editor-in-chief of Marvel Comics. He is possibly best known for introducing the pulp magazine hero Conan the Barbarian to American comics, with a series that added to the storyline of Robert E. Howard's character and helped launch a sword and sorcery trend in comics. Thomas is also known for his championing of Golden Age comic-book heroes – particularly the 1940s superhero team the Justice Society of America – and for lengthy writing stints on Marvel's X-Men and The Avengers, and DC Comics' All-Star Squadron, among other titles.

Among the comics characters he co-created are Wolverine, Vision, Doc Samson, Carol Danvers, Luke Cage, Iron Fist, Ultron, Yellowjacket, Defenders, Man-Thing, Red Sonja, Morbius, Ghost Rider, Squadron Supreme, Invaders, Black Knight (Dane Whitman), Nighthawk, Havok, Banshee, Sunfire, Thundra, Arkon, Killraven, Wendell Vaughn, Red Wolf, Red Guardian, Daimon Hellstrom, Brother Voodoo and Valkyrie.

Thomas was inducted into the Will Eisner Comic Book Hall of Fame in 2011 and into the Harvey Awards Hall of Fame in 2022.

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