Star Wars: Episode III – Revenge of the Sith is a 2005 American epic space opera film that is the sequel to The Phantom Menace (1999) and Attack of the Clones (2002). It is the sixth film in the Star Wars film series, the third installment in the Star Wars prequel trilogy, and third chronological chapter of the "Skywalker Saga". It is written and directed by George Lucas, who also served as executive producer. The film stars Ewan McGregor, Natalie Portman, Hayden Christensen, Ian McDiarmid, Samuel L. Jackson, Christopher Lee, Anthony Daniels, Kenny Baker, and Frank Oz.

Revenge of the Sith is set three years after the onset of the Clone Wars as established in Attack of the Clones. The Jedi are spread across the galaxy in a full-scale war against the Separatists. The Jedi Council dispatches Jedi Master Obi-Wan Kenobi on a mission to defeat General Grievous, the head of the Separatist army and Count Dooku's former apprentice, to put an end to the war. Meanwhile, after having visions of his wife Padmé Amidala dying in childbirth, Jedi Knight Anakin Skywalker is tasked by the Council to spy on Palpatine, the Supreme Chancellor of the Galactic Republic and, secretly, the Dark Lord of the Sith Darth Sidious. Sidious manipulates Anakin into turning to the dark side of the Force and becoming his apprentice, Darth Vader, with wide-ranging consequences for the galaxy.

Lucas began writing the script before production of Attack of the Clones ended, citing that he wanted the end of the trilogy to have similar aspects to a romantic tragedy, thus building into Darth Vader's state at the beginning of the next film. Production of Revenge of the Sith started in June 2003, and filming took place in Australia with additional locations in Thailand, Switzerland, China, Italy, and the United Kingdom.

Revenge of the Sith premiered on May 15, 2005, at the Cannes Film Festival, then released worldwide on May 19, 2005. The film received generally positive reviews from critics, with most regarding it as the best film of the trilogy, although some criticism was reserved for Lucas's screenplay and Christensen's performance. It broke several box office records during its opening week and went on to earn $868.4 million worldwide, making it the second-highest-grossing film in the Star Wars franchise at the time. It was the highest-grossing film in the U.S. and the second-highest-grossing film worldwide in 2005. It also holds the record for the highest opening-day gross on a Thursday, making $50 million. It is also the final Star Wars film to be distributed by 20th Century Fox, although it also would be acquired by Disney over six years after it acquired Lucasfilm.