- Jessica Chastain as Molly Bloom
- Idris Elba as Charlie Jaffey, Molly's lawyer
- Kevin Costner as Larry Bloom, Molly's father and a clinical psychologist
- Michael Cera as Player X, a composite character based on celebrity gamblers including Tobey Maguire, Leonardo DiCaprio, and Ben Affleck.[9]
- Jeremy Strong as Dean Keith, the real estate developer who brings Molly into the world of underground poker; inspired by Darin Feinstein
- Chris O'Dowd as Douglas Downey, the man who introduces Molly to the Russian mob and brings them to the table
- J. C. MacKenzie as Harrison Wellstone
- Brian d'Arcy James as Brad Marion, a hedge fund manager
- Bill Camp as Harlan Eustice, a card sharp who gets in over his head
- Graham Greene as Judge Dustin Foxman
- Justin Kirk as Jay
- Angela Gots as B
- Natalie Krill as Winston
- Joe Keery as Cole
- Michael Kostroff as Louis Butterman
- Claire Rankin as Charlene Bloom, Molly's mother and Larry's wife
- Jon Bass as Shelly Habib
- Samantha Isler as Teen Molly Bloom
- Kjartan Hewitt as Player
- Jacob Blair as Jeremy Bloom, Molly's brother
- Dan Lett as David Segan
- Rachel Skarsten as Leah
- Dov Tiefenbach as Club Customer
- David Reale as LA Player
- Jake Goldsbie as LA Player
- Chris Owens as LA Player
- Thomas Hauff as Mr. Sernovitz
- Ari Cohen as NY Player
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