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
Patrick de Ledebur
Senior Bully
Brian Balzerini
Linebacker
Tom Kruszewski
Nose Tackle
Julia Garner
Susan
Tom Savini
Mr. Callahan
Emily Marie Callaway
Mean Freshman Girl
Chelsea Zhang
Shakespeare Girl
Jesse Scheirer
Freshman Boy
Justine Nicole Schaefer
Twin Girl #1
Julie Marie Schaefer
Twin Girl #2
Leo Miles Farmerie
7-Year-Old Charlie
Isabel Muschweck
9-Year-Old Candace
Adam Hagenbuch
Bob
Erin Wilhelmi
Alice
Jordan Paley
Rocky MC
Zane Holtz
Chris
Timothy Breslin
Policeman
Mark McClain Wilson
Emergency Room Policeman
Atticus Cain
Emergency Room Doctor
Stacy Chbosky
Young Mom
Dihlon McManne
Priest
Laurie Klatscher
School Principal
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)