Robert Dennis Crumb (born August 30, 1943), often credited simply as R. Crumb, is an American artist and illustrator recognized for the distinctive style of his drawings and his critical, satirical, subversive view of the American mainstream. He currently lives in Sauve, France.

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.

Crumb is a 1994 documentary film about the noted underground comic artist Robert Crumb (R. Crumb) and his family. Directed by Terry Zwigoff and produced by Lynn O'Donnell, it won widespread acclaim, including the Grand Jury Prize at the Sundance Film Festival. The late critic Gene Siskel hailed Crumb as the best film of the year, as did critic Jeffrey M. Anderson, who writes for the San Francisco Examiner. It was released in the USA on April 28, 1995.

The tagline for the film is "Weird Sex, Obsession, Comic Books"; and while it is certainly full of all three, Crumb is considered a moving film about the experiences and characters of the Crumb family, particularly Robert Crumb's brothers, Maxon and Charles, his wife and children (his sisters declined to be interviewed).

Robert Crumb initially did not want to make the film, but eventually agreed. There was an urban legend, accidentally created by Roger Ebert, that Terry Zwigoff made Crumb cooperate by threatening to shoot himself. Ebert has clarified this in the commentary of the film's recent re-release.

This movie chronicles the life and times of R. Crumb. Robert Crumb is the cartoonist/artist who drew Keep On Truckin', Fritz the Cat, and played a major pioneering role in the genesis of underground comix. Through interviews with his mother, two brothers, wife, and ex-girlfriends, as well as selections from his vast quantity of graphic art, we are treated to a darkly comic ride through one man's subconscious mind. As stream-of-consciousness images incessantly flow forth from the tip of his pen, biting social satire is revealed, often along with a disturbing and haunting vision of Crumb's own betes noires and inadequacies. As his acid-trip induced images flicker across our own retinas, we gain a little insight into this complex and highly creative individual. Written by Tad Dibbern