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The show's main voice actors have included: Matt Lanter, James Arnold Taylor, Ashley Eckstein, Dee Bradley Baker, Catherine Taber, Tom Kane, Anthony Daniels, Ben Burtt, Ian Abercrombie, Corey Burton, Terrence C. Carson, Nika Futterman, and Matthew Wood.
Actors from the live-action films who returned to reprise their roles for the show include: Wood as the B1 Battle Droids and General Grievous, Ahmed Best as Jar Jar Binks (although Binks was voiced by Phil LaMarr[a] in three early episodes), Daniels as C-3PO, Burtt as R2-D2, Chewbacca,[b] and Darth Vader's breaths, Daniel Logan as the young Clone Trooper Cadets and Boba Fett, Liam Neeson as Qui-Gon Jinn, and Pernilla August as Shmi Skywalker, respectively. Additionally, Samuel L. Jackson and Christopher Lee reprised the roles of Mace Windu and Count Dooku in the animated film, respectively, but not in the television series.
Actors who appear by original recordings from Revenge of the Sith to represent their characters in the final season episode "Shattered" include: Hayden Christensen as Anakin Skywalker, Jackson as Mace Windu and Ian McDiarmid as Palpatine. The characters of Ahsoka and Darth Maul appear by motion capture of Lauren Mary Kim and Ray Park—who reprises his role from The Phantom Menace—in the episode "The Phantom Apprentice", whilst Eckstein and Sam Witwer retain the voice talent.
- Best claimed that the credited but unknown B.J. Hughes is Phil LaMarr, who later confirmed it.
- Peter Mayhew, the actor who played Chewbacca in the Original Trilogy, is given a special credit saying: "Special thanks to Peter Mayhew for being the heart and soul of Chewbacca".
- Via original archival audio from Star Wars: Revenge of the Sith
- As the breaths of the mute Darth Vader.
- Via motion capture.
- Young Clones.
- Via original recordings.
- "#AvatarParty!!! Were ewatching the finale today! Join now! @honor_society_". Twitch.tv. HonorSociety. 2020-12-19. Retrieved 2021-01-27.
Although the weird thing is, there was a third one, that I... piece I picked up, that was not actually known until last year. I played Jar Jar in two [sic!] episodes.