Melancholia is a 2011 science fiction drama film written and directed by Lars von Trier and starring Kirsten Dunst, Charlotte Gainsbourg, and Kiefer Sutherland, with Alexander Skarsgård, Brady Corbet, Cameron Spurr, Charlotte Rampling, Jesper Christensen, John Hurt, Stellan Skarsgård, and Udo Kier in supporting roles. The film's story revolves around two sisters, one of whom marries just before a rogue planet is about to collide with Earth. Melancholia is the second film in von Trier's unofficially titled Depression Trilogy. It was preceded in 2009 by Antichrist and followed by Nymphomaniac in 2013.

On 18 May 2011, Melancholia premiered at the 64th Cannes Film Festival, where it received critical acclaim and Dunst won the festival's Best Actress Award for her performance, which was a common area of praise among critics. Many critics and film scholars have considered the film to be a masterpiece. Along with von Trier's previous film Dogville (2003), it was included in the 2016 poll of the greatest films since 2000 conducted by BBC and has since been featured in various listings of the best films of the 21st century.