"Nationals" is the twenty-first episode of the third season of the American musical television series Glee, and the sixty-fifth overall. Written by Ali Adler and directed by Eric Stoltz, the episode is the second of two new episodes that aired back-to-back on Fox in the United States on May 15, 2012. It features New Directions facing off against Vocal Adrenaline at the Nationals show choir competition in Chicago, and several special guest stars: Whoopi Goldberg as NYADA dean Carmen Tibideaux, Jonathan Groff as Vocal Adrenaline director Jesse St. James, Lindsay Lohan as herself judging the competition and Rex Lee playing a Chicago alderman who is another of the judges.

The third season of the musical comedy-drama television series Glee was commissioned on May 23, 2010, by Fox while the first season aired. It aired between September 20, 2011, and May 22, 2012, and was produced by 20th Century Fox Television and Ryan Murphy Television, with executive producers Dante Di Loreto and series co-creators Ryan Murphy, Brad Falchuk and Ian Brennan.