A Night at the Opera is a 1935 American comedy film starring the Marx Brothers, and featuring Kitty Carlisle, Allan Jones, Margaret Dumont, Sig Ruman, and Walter Woolf King. It was the first of five films the Marx Brothers made under contract for Metro-Goldwyn-Mayer after their departure from Paramount Pictures, and the first after Zeppo left the act. The film was written by George S. Kaufman and Morrie Ryskind from a story by James Kevin McGuinness, with additional uncredited dialogue by Al Boasberg. The film was directed by Sam Wood.

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.