At the Circus is a 1939 comedy film starring the Marx Brothers released by Metro-Goldwyn-Mayer in which they help save a circus from bankruptcy. The film contains Groucho Marx's classic rendition of "Lydia the Tattooed Lady". The supporting cast includes Florence Rice, Kenny Baker, Margaret Dumont, and Eve Arden. The songs, including "Lydia the Tattooed Lady", "Two Blind Loves", and "Step Up and Take a Bow", were written by the team of Harold Arlen and Yip Harburg, who'd recently furnished the songs for another MGM film that same year, The Wizard of Oz.

The Marx Brothers were an American family comedy act that was successful in vaudeville, on Broadway, and in 14 motion pictures from 1905 to 1949. Five of the Marx Brothers' fourteen feature films were selected by the American Film Institute (AFI) as among the top 100 comedy films, with two of them, Duck Soup (1933) and A Night at the Opera (1935), in the top fifteen. They are widely considered by critics, scholars and fans to be among the greatest and most influential comedians of the 20th century. The brothers were included in AFI's 100 Years... 100 Stars list of the 25 greatest male stars of Classical Hollywood cinema, the only performers to be included collectively.