Obi-Wan Kenobi is a fictional character in the Star Wars franchise. Within the original trilogy, Obi-Wan is a Jedi Master as a supporting character and is portrayed by English actor Alec Guinness. In the later-released prequel trilogy, a younger version of the character serves as one of the two main protagonists, alongside Anakin Skywalker, and is portrayed by Scottish actor Ewan McGregor. In the original trilogy he is introduced as Ben Kenobi, an alias he uses while in hiding from the Empire. He is a mentor to Luke Skywalker, to whom he introduces the ways of the Jedi. After sacrificing himself in a duel against Darth Vader, Obi-Wan guides Luke through the Force in his fight against the Galactic Empire. In the prequel trilogy, set two decades earlier, he is initially a Padawan (apprentice) to Jedi Master Qui-Gon Jinn, and later mentor and friend of Luke's father Anakin, who falls to the dark side of the Force and becomes Vader. The character briefly appears in the sequel trilogy as a disembodied voice, speaking to protagonist Rey, and serving as the namesake of Ben Solo. He is frequently featured as a main character in various other Star Wars media, including the streaming television miniseries Obi-Wan Kenobi, in which McGregor reprised the role.

The Star Wars prequel trilogy, colloquially referred to as the prequels, is a series of epic space-opera films written and directed by George Lucas. It was produced by Lucasfilm Ltd. and distributed by 20th Century Fox. The trilogy was released from 1999 to 2005 and is set before the original Star Wars trilogy (1977–1983), chronologically making it the first act of the Skywalker Saga. Lucas had planned a prequel trilogy before the release of the original film, but halted major Star Wars films beyond the original trilogy by 1981. When computer-generated imagery (CGI) had advanced to the level he wanted for the visual effects he wanted for subsequent films, Lucas revived plans for the prequels by the early 1990s. The trilogy marked Lucas's return to directing after a 22-year hiatus following the original Star Wars film in 1977, as well as a 16-year hiatus between the classic and prequel trilogies.