Julius Henry "Groucho" Marx (; October 2, 1890 – August 19, 1977) was an American comedian, actor, writer, singer, stage, film, radio, television star and vaudeville performer. He is generally considered to have been a master of quick wit and one of America's greatest comedians.

He made 13 feature films as a team with his siblings the Marx Brothers; he was the third-born of the brothers. He also had a successful solo career primarily on radio and television, most notably as the host of the 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.