General Grievous is a character in the Star Wars franchise created by George Lucas. Introduced as an antagonist in the 2003 animated series Star Wars: Clone Wars (voiced by John DiMaggio in the second season and Richard McGonagle in the third season), he made his live-action debut in the 2005 film Star Wars: Episode III – Revenge of the Sith through computer-generated imagery. His voice was provided by sound editor Matthew Wood, who would reprise the role in most of Grevious's subsequent appearances, most notably the 2008 computer animated series Star Wars: The Clone Wars.

Grievous is a powerful Kaleesh cyborg and briliant military strategist who serves as the Supreme Commander of the Confederacy of Independent Systems' Droid Armies during the Clone Wars. He is renowned for his cruelty, oftentimes destroying his own droids out of frustration, his distinctive cough, and his ability to split his arms, allowing him to wield up to four lightsabers. Although not Force-sensitive, he was trained in lightsaber combat by Count Dooku to rival the Jedi of the Galactic Republic, whom Grievous harbors a strong hatred against and enjoys hunting for sport, collecting their lightsabers as trophies. During the Clone Wars, he develops a rivalry with Jedi Master Obi-Wan Kenobi, whom he clashes with numerous times, and is killed by Kenobi during their final confrontation in Revenge of the Sith.

The character has become one of the franchise's most iconic villains and his popularity within the Star Wars fandom has earned him a cult following. In addition to the film and the animated series, Grievous has appeared in various forms of media in the Star Wars Expanded Universe, including novels, comic books and video games. Some of these works explore his past as a reptilian warlord named Qymaen jai Sheelal who blamed the Jedi for the plight of his people, leading to his vendetta against them. A ship crash secretly orchestrated by Count Dooku mortally wounds Grievous and leads to his reconstruction as a cyborg to serve the Separatist cause. This origin story was retroactively altered in The Clone Wars, in which it is implied that Grievous willingly augmented his body with cybernetic enhancements to rival the Jedi, although several elements of his original backstory were later reintegrated into the current Star Wars canon.