• Idina Menzel as Elsa, queen of Arendelle and Anna's older sister, who has magical ice powers
• Kristen Bell as Anna, princess of Arendelle and Elsa's younger sister, who becomes queen of Arendelle after Elsa's abdication
• Josh Gad as Olaf, a snowman created by Elsa
• Jonathan Groff as Kristoff, an ice harvester and Anna's boyfriend. Groff also voices Sven, Kristoff's reindeer and several other reindeers
Frozen 2 also features Martha Plimpton as the Northuldra chief Yelena and Sterling K. Brown as the Arendelle lieutenant Mattias. Jason Ritter voices Ryder, a member of Northuldra; and Rachel Matthews voices Honeymaren, Ryder's sister who also resides in the Enchanted Forest.

Evan Rachel Wood voices Iduna (Elsa and Anna's mother), and Delaney Rose Stein voices the young Iduna. Alfred Molina voices Agnarr (Elsa and Anna's father), and Jackson Stein voices young Agnarr. Jeremy Sisto voices Runeard (Agnarr's father and Elsa and Anna's grandfather ); Ciarán Hinds voices the Rock Troll head Pabbie; and Aurora is "the voice" (a call to Elsa). Alan Tudyk voices a guard, a Northuldran leader, and an Arendellian soldier. Paul Briggs reprised his role in the post-credits scene as Marshmallow, a snow monster created by Elsa.

Producer Peter Del Vecho said on March 31, 2014, that he, Chris Buck, and Jennifer Lee collaborated well, and he envisioned another Frozen-related project. The following month, Walt Disney Studios chairman Alan F. Horn said that a sequel would not be immediately forthcoming because the studio was focusing on a Broadway musical adaptation of Frozen. In a May 2014 CNBC interview with David Faber, the Walt Disney Company CEO Bob Iger said that the company would not force the development of a sequel, because it was concerned about not living up to the first film. Iger said that the Frozen franchise "is something that is kind of forever for the company", similar to The Lion King.

On June 10, 2014, Lee confirmed that Walt Disney Studios CCO John Lasseter had authorized her and Buck to explore a possible sequel. While working on the short film Frozen Fever (2015), they realized that they missed the characters. Meanwhile, Del Vecho had been asked by fans about Frozen's future. Lee, Buck, and Del Vecho discussed the possibility of a sequel. Buck later said, "The one thing that we did right away was to figure out what would be satisfying for Anna and Elsa at the end of the movie." They decided on ending the sequel with Anna becoming the queen of Arendelle, while Elsa would be "free".
Iger, Lasseter, and actor Josh Gad announced at Disney's March 12, 2015, annual shareholders' meeting in San Francisco that Frozen 2, a full-length sequel, was in development; Buck and Lee would return as directors, and Del Vecho as producer. The production team traveled to Norway, Finland, and Iceland for background research; they decided to make Elsa a "mythic hero" with magic ice powers and Anna a "fairytale hero" who lives in a magical world but has no magic powers. They concluded that the first film successfully combined the two elements. Allison Schroeder was hired to assist Lee with the script in August 2018 after Lee succeeded Lasseter as Disney Animation's CCO; Lee was credited as the film's screenwriter, and Schroeder was credited with additional screenplay material. The film's story contributions were made by Lee, Buck, Marc Smith, Kristen Anderson-Lopez, and Robert Lopez. Overall, the budget was approximately $150 million.

Voice recording began in September 2017, although Menzel started a couple of weeks later due to a concert tour. That month, Gad announced his role in the sequel with Buck, Lee, Del Vecho, and Lasseter. In July 2018, Variety reported that Wood and Brown were in talks to join the cast. Their roles were later disclosed as Iduna and Lieutenant Destin Mattias. Wood was cast because her voice resembled Menzel and Bell's. The voice of Agnarr was changed from Maurice LaMarche to Molina. The Voice's four-note call, derived from the Latin sequence "Di…

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The indigenous Sámi people were historically associated with reindeer, and identified with the animals' strength. Trude Fonneland wrote that a female divinity emphasized female contributions with themes including unity, courage, hope, friendship, and truth. Elsa attempted to send Anna away because she was concerned about her sister's safety.

In animation, female characters embody female images as a whole. The film's female characters are emotionally diverse, motivated by social status and awakening of feminism. The elegant, noble Elsa wants to be free and live a normal life, and Anna is dreamy, cheerful and enthusiastic; both acted to defend their kingdom from danger.

Frozen 2 has been interpreted as a critique of colonialism and as advocating reparation. Before Elsa and Anna were born, their grandfather King Runeard built a dam for the Northuldra tribe. Ostensibly a gift, the dam weakens the tribe's magical power. Runeard's plot fails after he murders the leader of Northuldra and war breaks out. The forest spirits which preside over Northuldra shroud it in an impenetrable mist, preventing anyone from leaving or entering. The Northuldra are modeled on the Sámi people, indigenous to Scandinavia and northwestern Russia, who experienced discrimination as pagans reputed to be skilled in magic and witchcraft. In 1609, King Christian IV of Denmark wrote that the Sámi were adept at magic, and no mercy should be granted in cases involving Sámi sorcery. Nordic missionaries confiscated or destroyed religious items and sites and built churches to supplant Sámi shamanism.

The Northuldra dam reflects Sámi history. A hydroelectric power station was built on the Altaelva river in Norway from 1979 to 1981; the controversial Virdnejávr Dam flooded a Sámi village, disrupting traditional hunting and herding. Slate critic Inkoo Kang said that although Frozen 2 was obviously influenced by Sámi history, the Northuldra may also be interpreted as representing displaced Native Americans; Arendelle can be seen as representing the United States' colonial past, evocative of the embellished life of Pocahontas. The Northuldra are presented in an appealing way, romanticized as a people with magical power who live in harmony with the spiritual and physical worlds.

While Elsa attempts to find out who was calling her, Anna destroys the dam to make amends to the Northuldra for Arendelle's mistakes. Elsa's last-minute intervention prevents the destruction of the kingdom, but Anna destroys the dam in the belief that Elsa is dead. According to Kang, the film promotes reparations for past atrocities. Matt Goldberg wrote that the symbolism of the film's ending is undercut by having Elsa save Arendelle, instead of rebuilding the kingdom elsew…

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