Rollista

• Nat Wolff — Quentin Jacobsen
• Cara Delevingne — Margo Roth Spiegelman
• Justice Smith — Marcus 'Radar' Lincoln
• Austin Abrams — Ben Starling
• Halston Sage — Lacey Pemberton
• Jaz Sinclair — Angela
• Cara Buono — Connie Jacobsen
• Stevie Ray Dallimore — Josh Jacobsen
• Meg Crosbie — Ruthie Spiegelman
• Caitlin Carver — Becca Arrington
• Griffin Freeman — Jase Worthington
• Susan Macke Miller — Debbie Spiegelman
• Tom Hillmann — Hank Spiegelman
• Ansel Elgort — Mason
• Drew Matthews — Gus
• Hannah Riley — Young Margo
• Kendall McIntyre — Ben at Age 12
• Jay Duplass — English Teacher
• John Green — Dwight Arrington (voice)