Robert Dennis Crumb (born August 30, 1943)—known as Robert Crumb and R. Crumb—is an American artist, illustrator, and musician recognized for the distinctive style of his drawings and his critical, satirical, subversive view of the American mainstream.

Crumb was a founder of the underground comix movement and is regarded as its most prominent figure. Though one of the most celebrated of comic book artists, Crumb's entire career has unfolded outside the mainstream comic book publishing industry. One of his most recognized works is the "Keep on Truckin'" comic, which became a widely distributed fixture of pop culture in the 1970s. Others are the characters Devil Girl, Fritz the Cat, and Mr. Natural.

He was inducted into the comic book industry's Will Eisner Comic Book Hall of Fame in 1991.