- Josh Hutcherson as Jesse “Jess” Aarons, a 6th grader and an aspiring artist.
- AnnaSophia Robb as Leslie Burke, a 6th grade girl whom Jess befriends.
- Bailee Madison as May Belle Aarons, the little sister of Jess.
- Zooey Deschanel as Ms. Edmunds, a music teacher that Jess likes.
- Robert Patrick as Jack Aarons, the father of Jess and May Belle.
- Kate Butler as Mary Aarons, the mother of Jess and May Belle.
- Devon Wood as Brenda Aarons, the older sister of Jess and May Belle.
- Emma Fenton as Ellie Aarons, the older sister of Jess and May Belle.
- Grace Brannigan as Joyce Aarons, the baby sister of Jess and May Belle.
- Latham Gaines as Bill Burke, the father of Leslie.
- Judy McIntosh as Judy Burke, the mother of Leslie.
- Patricia Aldersley as Grandma Burke, the grandmother of Leslie.
- Lauren Clinton as Janice Avery, a bully of Jess and Leslie who serves as the inspiration to the giant troll
- Isabelle Kircher as Carla
- Cameron Wakefield as Scott Hoager, one of Jess's bullies who serves as the inspiration to the squirrel-like Squogres.
- Elliot Lawless as Gary Fulcher, one of Jess's bullies who serves as the inspiration to the hairy vultures.
- Carly Owen as Madison
- Jen Wolfe as Mrs. Myers, a teacher.
- James Gaylyn as Principal Turner
- Ian Harcourt as Kenny, a bus driver.
- Phil Grieve as Mr. Bailey
- Matt Gibbons as the Dark Master, an evil being in Terabithia that antagonizes Jess and Leslie.
- Paddy as Prince Terrien, a dog that is adopted by the Burke family.
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