Jurassic World: Dominion (2022) - In September 2015, Trevorrow said that Bryce Dallas Howard's character would evolve the most over the course of the Jurassic World trilogy. In October 2015, Frank Marshall confirmed plans for a sixth film in the series. In November 2015, Universal Pictures chairman Donna Langley said that Trevorrow and Spielberg have a story idea for the sixth film. In September 2016, Bayona further confirmed that Trevorrow has plans for a Jurassic World trilogy. That month, Trevorrow was asked how much planning he had put into a new trilogy while he was filming Jurassic World in 2014: "I knew the end. I knew where I wanted it to go." Trevorrow later said that planning the beginning, middle, and end of the trilogy ahead of time "is crucial to a franchise like this if you really want to bring people along with you and make sure they stay interested. It needs to be thought through on that level. It can't be arbitrary ... the earlier Jurassic Park movies had pretty clear definitive endings. They were much more episodic." In March 2017, Laura Dern commented, "As I said to the people who are making the new series, 'If you guys make a last one, you gotta let Ellie Sattler come back.'"

In February 2018, it was announced that the film, temporarily titled Jurassic World 3, would be released on June 11, 2021. It was also announced that Trevorrow would write the script with Emily Carmichael, based on a story by Trevorrow and Connolly; and that Trevorrow and Spielberg would serve as executive producers for the film, with Marshall and Crowley as producers. On March 30, 2018, it was announced that Trevorrow would also direct the film, at the request of Spielberg. Trevorrow met Carmichael after seeing a short film of hers, and said, "I just knew immediately that I loved her brain."[ Trevorrow was subsequently impressed with Carmichael's writing work on Pacific Rim Uprising and a remake of The Black Hole, leading him to choose her as a co-writer for Jurassic World 3. Trevorrow and Carmichael were writing the script as of April 2018. At the time, Trevorrow said that Pratt and Howard would reprise their roles from the previous films, and that there were other characters in Fallen Kingdom who "you'll realize are major characters." Additionally, Trevorrow said that Jurassic World 3 would be a "science thriller," describing it as being the Jurassic World film that would most closely match the tone of Spielberg's original 1993 Jurassic Park film. In May 2018, Trevorrow announced that the film would focus more on real dinosaurs as opposed to hybrids, which had prominent roles in the previous Jurassic World films.

In June 2018, Trevorrow stated that the film would focus on the dinosaurs that went open source after being sold and spread around the world in Jurassic World: Fallen Kingdom, allowing people other than Dr. Henry Wu to create their own dinosaurs. Trevorrow stated that the film would be set around the world, and said that the idea of Henry Wu being the only person who knows how to create a dinosaur was far-fetched "after 30 years of this technology existing" within the films' universe. Additionally, the film would focus on the dinosaurs that were freed at the end of Jurassic World: Fallen Kingdom, but it would not depict dinosaurs terrorizing cities and going to war against humans; Trevorrow considered such ideas unrealistic. Instead, Trevorrow was interested in a world where "a dinosaur might run out in front of your car on a foggy backroad, or invade your campground looking for food. A world where dinosaur interaction is unlikely but possible—the same way we watch out for bears or sharks." Trevorrow said that the film would also be about Owen and Claire's responsibility to take care of Maisie, a cloned girl from the previous film.

Certain scenes and ideas regarding the integration of dinosaurs into the world were ultimately removed from the Jurassic World: Fallen Kingdom script to be saved for the third film. Trevorrow said about the realism of the film's story, "I think any kind of global acceptance that [dinosaurs] are just around doesn't feel real to me because, even now when you think of animals, when was the last time you saw a tiger walking down the street? We know there are tigers. We know they're out there. But to me, it's very important that we keep this grounded in the context of our relationship with wild animals today." Howard stated that she wanted the film to "blow your mind in terms of being like, 'Whoa, this is where this technology can go. This is what the world could really turn into if this technology fell into the wrong hands.' So basically seeing a world with dinosaurs everywhere." Jurassic World 3 is scheduled to begin filming in spring 2020.