Lawrence D. Lieber (/ˈliːbər/; born October 26, 1931) is an American comic book writer and artist best known as the co-creator of the Marvel Comics superheroes Iron Man, Thor, and Ant-Man. He is also known for his long stint both writing and drawing the Marvel Western Rawhide Kid and for illustrating the newspaper comic strip The Amazing Spider-Man from 1986 to 2018. From 1974 to 1975, he was editor of Atlas/Seaboard Comics. Lieber is the younger brother of Stan Lee, who had been a writer, editor, and publisher of Marvel Comics.

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