George D. Klein was an American comic book artist and cartoonist whose career stretched from the 1930s and 1940s' Golden Age of comic books until his death in 1969. He was best known as an inker for DC Comics, where he was an integral part of the Superman family of titles from 1955 to 1968, and for Marvel Comics, where he was the generally recognized, uncredited inker on Jack Kirby's pencil art for the landmark comic book The Fantastic Four #1.

Timely Comics is the common name for the group of corporations that was the earliest comic book arm of American publisher Martin Goodman, and the entity that would evolve by the 1960s to become Marvel Comics.