Julia Scarlett Elizabeth Louis-Dreyfus (; born January 13, 1961) is an American actress, comedian, and producer. In television comedy, she is known for her work in Saturday Night Live (1982–1985), Seinfeld (1989–1998), The New Adventures of Old Christine (2006–2010), and Veep (2012–present). She is one of the most awarded actors in television history, winning more Emmy Awards and more Screen Actors Guild Awards than any other performer (eight of the Emmy awards were for acting, tying Cloris Leachman for the most acting Primetime Emmy wins, she has also received three Emmy awards for producing).

Louis-Dreyfus broke into comedy as a performer in The Practical Theatre Company in Chicago, Illinois, which led to her casting in the sketch show Saturday Night Live from 1982 to 1985. Her breakthrough came in 1989 with a nine-season run playing Elaine Benes on Seinfeld, one of the most critically and commercially successful sitcoms of all time. Other notable television roles include Christine Campbell in The New Adventures of Old Christine, which had a five-season run on CBS, and her role as Selina Meyer in Veep, which has been renewed by HBO for a seventh and final season. Her film roles have included Hannah and Her Sisters (1986), National Lampoon's Christmas Vacation (1989), Deconstructing Harry (1997), and Enough Said (2013). She voiced roles in the animated films A Bug's Life (1998) and Planes (2013).

Louis-Dreyfus has received eleven Emmy Awards, eight for acting and three for producing, with a total of 24 nominations throughout her career. She has also received a Golden Globe Award, nine Screen Actors Guild Awards, five American Comedy Awards, and two Critics' Choice Television Awards. Louis-Dreyfus received a star on the Hollywood Walk of Fame in 2010, and was inducted into the Television Academy Hall of Fame in 2014. In 2016, Time named Louis-Dreyfus one of the 100 most influential people in the world on the annual Time 100 list. In 2018 it was announced she would be the recipient of the Mark Twain Prize for American Humor, presented by the Kennedy Center as America's highest comedy honor.