Avatar: Fire and Ash is an upcoming American epic science fiction film co-produced, co-edited, co-written, and directed by James Cameron. Produced and distributed by 20th Century Studios, it is the sequel to Avatar (2009) and Avatar: The Way of Water (2022) and the third installment in the Avatar film series. Cameron had been producing the film with Jon Landau. Cameron, Rick Jaffa, Amanda Silver, Josh Friedman, and Shane Salerno were involved in the writing process. Cast members Sam Worthington, Zoe Saldaña, Stephen Lang, Sigourney Weaver, Joel David Moore, CCH Pounder, Giovanni Ribisi, Dileep Rao, Matt Gerald, Kate Winslet, Cliff Curtis, Edie Falco, Brendan Cowell, Jemaine Clement, Britain Dalton, Trinity Jo-Li Bliss, Jack Champion, Bailey Bass, Filip Geljo and Duane Evans, Jr. reprise their roles from previous films, while David Thewlis and Oona Chaplin portray new characters.

Cameron, who had stated in 2006 that he would like to make sequels to Avatar (2009) if it was successful, announced the first two sequels in 2010 following the success of the first film, with the then-untitled Avatar 3 aiming for a 2015 release. However, the addition of two more sequels (four in total), and the development of new technology required to film performance capture scenes underwater, a feat never accomplished before, led to significant delays to allow the crew more time to work on the writing, pre-production, and visual effects. Avatar: Fire and Ash started shooting simultaneously with Avatar: The Way of Water in New Zealand on September 25, 2017; filming completed in late December 2020, after over three years of shooting.

The film's theatrical release has been subject to nine delays, with the latest occurring on August 9, 2024; it is scheduled for release on December 19, 2025. Two additional sequels, Avatar 4 and Avatar 5, are in various stages of production and are expected to be released in 2029 and 2031, respectively.