Guest
Benjamin Flores Jr. as Brandon Bowman (season 1), Darius' older brother. Flores reprises his role from Camp Cretaceous.
Alan Trinca as Mike (season 1), a DPW trainee and Ronnie's partner
Brock Powell as Mo (season 1), a gas station attendant in Texas
Andrew Kishino as Daniel Kon (seasons 1–2), Kenji's estranged father and the former president of Mantah Corp, who was placed under house arrest after the Nublar Six exposed him. Kishino reprises his role from Camp Cretaceous.
Luis Bermudez as Bobby Nublar (season 1), the proprietor of a dinosaur-themed roadside attraction
Chris Jai Alex as Jared (season 1), a corrupt DPW officer working with Jensen
Stephen Fu as Captain Lang (season 2), the captain of a cargo ship who smuggles dinosaurs out of North America for the Broker
Gideon Emery as Sullivan (season 2), the first mate onboard Lang's ship
Skyler Gisondo as Earnest (seasons 2, 4), the leader of Dinosaur Liberation Now (DLN), a group of vigilantes who set captive dinosaurs free. He later reappears as a Biosyn employee.
Samba Schutte as Ousmane Mballo (season 2), Zayna's father, who works away from his family's farm
Ike Amadi as Dr. Sarr (season 2), the head of a secret dinosaur cloning facility in Senegal who works for the Broker
Sendhil Ramamurthy as Chuck Desai (season 3), Ben and Gia's former university professor and an advisor to the UN
Ramamurthy also voices Dr. Samuelson (season 4), a Biosyn scientist who works with Dr. Munnerlyn to train Atrociraptors
Peter Arpesella as Vito (season 3), a resident of a small town in northern Italy
Sean Rohani as Rio (season 3), a dinosaur smuggler based in an underground black market in Malta
Greg Chun as Dr. Henry Wu (season 4), the chief geneticist at Biosyn who previously worked for InGen at Jurassic World. Chun reprises his role from Camp Cretaceous. Wu was previously portrayed by BD Wong in multiple films beginning with Jurassic Park.
Sirena Irwin as Sirena (season 4), a medic working for Biosyn alongside Dustin. Irwin also serves as the voice director for the series.
Scott Kreamer as Mathias (season 4), the team leader of a group of Biosyn employees. Kreamer also serves as the co-creator and co-showrunner of the series.
Several notable creatures from Jurassic Park media make an appearance. This includes the blind-eyed Allosaurus from Battle at Big Rock who is responsible for Brooklynn's suspected death while the quartet of trained Atrociraptors Ghost, Panthera, Tiger, and Red as well as the Giganotosaurus and Therizinosaurus, are all from Jurassic World Dominion. It also includes Bumpy, Ben's Ankylosaurus companion with an asymmetrical face, and Big Eatie, a mother Tyrannosaurus rex from Mantah Corp Island, who were both introduced in Camp Cretaceous. Boss, a Carnotaurus from Jurassic World: Fallen Kingdom, the Tyrannosaurus rex Rexy from Jurassic Park, and both Buck and Doe from The Lost World: Jurassic Park, also make an appearance.
Other notable dinosaurs that appear include: Blonde and Brunette, a pair of Becklespinaxes transported by Jensen and Jared; Prue, Piper, and Phoebe, a Stygimoloch trio serving as a roadside attraction for Bobby Nublar; Major, a Majungasaurus held captive on Captain Lang's cargo ship; Geba, a playful Gallimimus who lives on the Mballo family farm; Gordon, a one-footed Compsognathus under Ronnie's care; a blind leucistic Baryonyx created by Dr. Sarr; a Pyroraptor escapee from Biosyn Valley; Smoothie, a baby Ankylosaurus under Kenji's protection who hatched from Bumpy's egg; Allan, Barbara, Kenneth, and Kristy, a pack of Dilophosaurus living in Biosyn Valley, and Blender, Bumpy's mate and Smoothie's father.
