Susan Alva Fleming (February 19, 1908 – December 22, 2002) was an American actress and the wife of comic actor Harpo Marx and sister in law to Groucho, Chico, Zeppo and Gummo.

Fleming combined her dancing and cinematic interests in the 1932 movie Million Dollar Legs, in which she played the daughter of W. C. Fields's character.

[3] Fleming's wedding to Marx was revealed to the public when President of the United States Franklin D. Roosevelt sent the couple a telegram of congratulations in November.

She became an advisory planning commissioner for Rancho Mirage, California, and headed an organization dedicated to preserving development on the fragile desert hillsides.

She served a total of 18 years on the district board of education and ran and lost in a campaign for the California State Assembly.

[9] In a 1981 decision later overruled by the United States Court of Appeals for the Second Circuit in a case brought by Fleming, federal judge William C. Conner ruled that the producers of A Day in Hollywood / A Night in the Ukraine had improperly used the Marx Brothers characters in their Broadway theatre production and that the publicity rights of the comedians, even after their deaths, overrode the First Amendment issues raised by the show's creators.

[10] In April 1980, Conner refused to issue a preliminary injunction and allowed producer Alexander H. Cohen to open the show as planned.