Julius Henry "Groucho" Marx (; October 2, 1890 – August 19, 1977) was an American comedian, writer, stage, film, radio, and television star. A master of quick wit, he is widely considered one of America's greatest comedians.

He made 13 feature films with his siblings the Marx Brothers, of whom he was the third-born. He also had a successful solo career, most notably as the host of the radio and television game show You Bet Your Life.

His distinctive appearance, carried over from his days in vaudeville, included quirks such as an exaggerated stooped posture, spectacles, cigar, and a thick greasepaint mustache and eyebrows. These exaggerated features resulted in the creation of one of the most recognizable and ubiquitous novelty disguises, known as Groucho glasses: a one-piece mask consisting of horn-rimmed glasses, a large plastic nose, bushy eyebrows and mustache.