Nat Wolff
Quentin
Cara Delevingne
Margo
Austin Abrams
Ben
Justice Smith
Radar
Halston Sage
Lacey
Jaz Sinclair
Angela
Cara Buono
Mrs. Jacobsen
Josiah Cerio
Young Quentin
Hannah Riley
Young Margo
Meg Crosbie
Ruthie
Griffin Freeman
Jase
Caitlin Carver
Becca
RJ Shearer
Chuck
Susan Macke Miller
Mrs. Spiegelman
Tom Hillmann
Mr. Spiegelman
Stevie Ray Dallimore
Mr. Jacobsen
Jay Duplass
English Teacher
Emma O'Loughlin
Freshman Girl
Kendall McIntyre
Ben (Age 12)
Yossie Mulyadi
Checkout Girl
Drew Matthews
Gus
Marta Martin
Spanish Teacher
Virginia Riggsbee
Student in Hallway 1
Bailey Nemirow
Student in Hallway 2
Christopher Pell
Student in Hallway 3
Jim R. Coleman
Detective Warren
Sophia Grillo
Fashionable Girl
Rob C. Baldwin
Roadside Assistant
Ansel Elgort
Mason (uncredited)
John Green
Becca's Father (voice) (uncredited)
Lane Lovegrove
Robert Joyner (uncredited)