Robert Armstrong (born 1950) is a cartoonist, illustrator, painter, and musician. He is known for his underground comix character Mickey Rat, for popularizing the term "couch potato," and for being a member of Robert Crumb's band the Cheap Suit Serenaders.

Mickey Rat (an obvious parody of Mickey Mouse) was created by Armstrong in 1971 as a character on a T-shirt. The popularity of the character led to him appearing in comics, which were initially scripted by Chester C. Crill.[citation needed] Mickey's first appearance was L.A. Comics #1 (published by the Los Angeles Comic Book Company in December 1971). Mickey was "sleazy, opportunistic, capable of just about any foul deed, but also shallow, one-dimensional, and incapable of growth or subtlety. He seems to have had little in the way of motivation, beyond his creators' desire to make him the opposite of the other Mickey in every possible way."