Jack Black

Dewey Finn

Joan Cusack

Rosalie Mullins

Mike White

Ned Schneebly

Sarah Silverman

Patty Di Marco

Miranda Cosgrove

Summer Hathaway

Joey Gaydos Jr.

Zack

Kevin Alexander Clark

Freddy Jones

Rivkah Reyes

Katie

Robert Tsai

Lawrence

Maryam Hassan

Tomika

Aleisha Allen

Alicia

Caitlin Hale

Marta

Brian Falduto

Billy

Z Infante

Gordon

James Hosey

Marco

Angelo Massagli

Frankie

Cole Hawkins

Leonard

Lee Wilkof

Mr. Green

Kate McGregor-Stewart

Mrs. Lemmons

Adam Pascal

Theo

Lucas Babin

Spider

Lucas Papaelias

Neil

Chris Stack

Doug

Suzzanne Douglas

Tomika's Mother

Jordan-Claire Green

Michelle

Eron Otcasek

Musician

Carlos Velazquez

Musician

Wally Dunn

Gym Teacher

Tim Hopper

Zack's Father

Nicky Katt

Razor

Heather Goldenhersh

Sheila

Timothy "Speed" Levitch

Waiter

Sharon Washington

Alicia's Mother

Kim Brockington

Leonard's Mother

Kathleen McNenny

Freddy's Mother

Joanna Adler

Summer's Mother

Robert Lin

Lawrence's Father

Barry Shurchin

Cop

MacIntyre Dixon

Bus Driver

Amy Sedaris

Mrs. Haynish

Mandy Siegfried

Female Employee

Elle Key

Concert Goer

Frank Whaley

Battle of the Bands Director (uncredited)

Lauren Adler

Concert Goer (uncredited)

Kelly Anne Burns

Groupie (uncredited)

Leanne Cabrera

Concert Goer (uncredited)

Catherine A. Callahan

Concert Goer (uncredited)

Cedric Cannon

Leonard's Dad (uncredited)

Jane DeNoble

Billy's Mom (uncredited)

Caileigh Scott

Concert Goer (uncredited)

Riley G. Matthews, Jr.

Blood Brothers MC Biker (uncredited)

Ryan O'Connor

No Vaccancy's Biggest Fan (uncredited)

Jamie Vergan

Concert Goer (uncredited)