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===Apes===
* [[Andy Serkis]] as [[Caesar (Planet of the Apes)|Caesar]], a [[chimpanzee]] who is leader to a tribe of enhanced [[ape]]s.<ref name="Greer" />
* [[Steve Zahn]] as Bad Ape, a chimpanzee who fled from the [[Sierra Safari Zoo]] after seeing his family and acquaintances being blamed for the Simian flu and killed by soldiers.<ref name="ZahnCast">{{cite web | first1=Jeff | last1=Sneider | url=https://www.thewrap.com/steve-zahn-to-play-new-ape-in-next-planet-of-the-apes-movie/ | title=Steve Zahn to Play New Ape in Next 'Planet of the Apes' Movie | date=12 October 2015 | access-date=13 October 2015 | publisher=[[TheWrap]] | archive-date=November 8, 2020 | archive-url=https://web.archive.org/web/20201108135856/https://www.thewrap.com/steve-zahn-to-play-new-ape-in-next-planet-of-the-apes-movie/ | url-status=live}}</ref><ref name="Bad Ape Interview">{{cite web | first1=Angie | last1=Han | url=https://www.slashfilm.com/war-for-the-planet-of-the-apes-steve-zahn-interview/ | title=War for the Planet of the Apes: Steve Zahn Interview | date=26 December 2016 | access-date=30 December 2016 | website=[[Slashfilm]].com | archive-date=August 4, 2020 | archive-url=https://web.archive.org/web/20200804002458/https://www.slashfilm.com/war-for-the-planet-of-the-apes-steve-zahn-interview/ | url-status=live}}</ref>
* [[Toby Kebbell]] as [[Koba (Planet of the Apes)|Koba]], a treacherous [[bonobo]] whose abusive past caused him to develop a hatred towards humans and is responsible for the war. He appears to Caesar as a hallucination.
* [[Judy Greer]] as Cornelia, Caesar's chimpanzee wife.<ref name="Greer">{{cite web | url=https://hollywoodreporter.com/heat-vision/judy-greer-returning-planet-apes-833074 | title=Judy Greer Returning to 'Planet of the Apes' (Exclusive) | work=The Hollywood Reporter | date=20 October 2015 | access-date=21 October 2015 | last=Kit | first=Borys | archive-date=August 14, 2020 | archive-url=https://web.archive.org/web/20200814230202/https://www.hollywoodreporter.com/heat-vision/judy-greer-returning-planet-apes-833074 | url-status=live}}</ref>
* [[Karin Konoval]] as Maurice, a [[Bornean orangutan]] and Caesar's loyal adviser and friend.<ref name="Greer" />
* [[Terry Notary]] as Rocket, Caesar's loyal chimpanzee lieutenant.<ref name="MotionCapture">{{cite news|last1=Trumbore|first1=Dave|title=First Look at 'War for the Planet of the Apes' Reveals Motion-Capture Mayhem|url=https://collider.com/war-for-the-planet-of-the-apes-contest-matt-reeves-andy-serkis/|access-date=23 November 2015|publisher=Collider|date=23 November 2015|archive-date=February 24, 2020|archive-url=https://web.archive.org/web/20200224053950/https://collider.com/war-for-the-planet-of-the-apes-contest-matt-reeves-andy-serkis/|url-status=live}}</ref>
* [[Michael Adamthwaite]] as Luca, a [[western lowland gorilla]] and chief commander of the guards in Caesar's tribe.
* [[Ty Olsson]] as Red, a western lowland gorilla who was a follower of Koba, and now works for AΩ as a "donkey."
* [[Devyn Dalton]] as Cornelius, Caesar's younger chimpanzee son.
* [[Sara Canning]] as Lake, Blue Eyes' young chimpanzee wife.<ref name="CanningCast">{{cite web | url=https://deadline.com/2015/10/war-for-the-planet-of-the-apes-adds-sara-canning-as-ape-1201594607/ | title=Sara Canning To Monkey Around In 'War For The Planet Of The Apes' | author=Ross A. Lincoln | website=Deadline Hollywood | access-date=27 October 2015 | date=26 October 2015 | archive-date=October 28, 2015 | archive-url=https://web.archive.org/web/20151028004535/http://deadline.com/2015/10/war-for-the-planet-of-the-apes-adds-sara-canning-as-ape-1201594607/ | url-status=live}}</ref>
* [[Aleks Paunovic]] as Winter, an albino western lowland gorilla in Caesar's tribe, who later joins forces with AΩ.<ref name="PaunovicCast">{{cite web | url=https://deadline.com/2015/10/war-for-the-planet-of-the-apes-adds-aleks-paunovic-as-ape-1201591583/ | title=Aleks Paunovic To Make 'War for the Planet of the Apes'; Newcomer Zachary Haven Joins 'Bastards' | website=Deadline Hollywood | date=22 October 2015 | access-date=23 October 2015 | author=Ross A. Lincoln}}</ref>
* Max Lloyd-Jones as Blue Eyes, Caesar's young chimpanzee son.
===Humans===
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