Logan Lerman

Charlie

Emma Watson

Sam

Ezra Miller

Patrick

Mae Whitman

Mary Elizabeth

Kate Walsh

Mother

Dylan McDermott

Father

Melanie Lynskey

Aunt Helen

Nina Dobrev

Candace

Johnny Simmons

Brad

Joan Cusack

Dr. Burton

Paul Rudd

Mr. Anderson

Nicholas Braun

Ponytail Derek

Reece Thompson

Craig

Julia Garner

Susan

Tom Savini

Mr. Callahan

Chelsea Zhang

Shakespeare Girl

Adam Hagenbuch

Bob

Erin Wilhelmi

Alice

Zane Holtz

Chris

Mark McClain Wilson

Emergency Room Policeman

Atticus Cain

Emergency Room Doctor

Stacy Chbosky

Young Mom

Landon Pigg

Peter

Jennifer Enskat

Sam's Mom

William L. Thomas

Patrick's Dad

Morgan Wolk

Candace's Friend

Joe Fishel

Father of Twin Girls (uncredited)