- Shailene Woodley as Beatrice "Tris" Prior, a 16-year-old girl formerly of Abnegation who joins Dauntless
- Elyse Cole as 10 year old Tris
- Theo James as Tobias "Four" Eaton, a Dauntless instructor who becomes Tris's boyfriend
- Ashley Judd as Natalie Prior, Tris's mother
- Jai Courtney as Eric Coulter, the ruthless leader of Dauntless
- Ray Stevenson as Marcus Eaton, the city council leader of Abnegation and Four's father
- Zoë Kravitz as Christina, a new member of Dauntless and a friend of Tris
- Miles Teller as Peter Hayes, a member of Dauntless who was an original member of Candor
- Tony Goldwyn as Andrew Prior, Tris's father and a member of Abnegation
- Ansel Elgort as Caleb Prior, Tris's brother who is a member of Erudite
- Maggie Q as Tori Wu, Tris's test administrator
- Mekhi Phifer as Max
- Kate Winslet as Jeanine Matthews, the leader of Erudite faction
- Ben Lloyd-Hughes as Will
- Christian Madsen as Albert
- Amy Newbold as Molly Atwood
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