Amanda Seyfried Karen Smith
Rachel McAdams Regina George
Lacey Chabert Gretchen Wieners
Lindsay Lohan Cady Heron
Lizzy Caplan Janis Ian
Tina Fey Ms. Norbury, Screenplay
Neil Flynn Cady's Dad
Diego Klattenhoff Shane Oman
Jonathan Bennett Aaron Samuels
Ana Gasteyer Cady's Mom
Amy Poehler Mrs. George
Eve Crawford English Teacher
Mark Waters Director
Tim Meadows Mr. Duvall
Daniel DeSanto Jason
Ely Henry Homeschooled Boy
Miranda Edwards Michigan Girl
Jill Morrison Crying Girl
Jonathan Malen Kristen's Boyfriend
Lorne Michaels Producer
Laura de Carteret Mrs. Wedell
Frank Smathers Dialogue Editor
Daniel Franzese Damian
Rolfe Kent Original Music Composer
Bruce Hunter Mathlete Moderator
Dana E. Glauberman Additional Editing
Sharron Matthews Joan the Secretary
David Reale Glenn Coco (uncredited)
Bob Baron ADR Mixer
Daryn Okada Director of Photography
Kristen Bone Short Girl
Chuck Michael Supervising Sound Editor
Dwayne Hill Coach Carr
Jo-Ann MacNeil Makeup Artist
Marci Liroff Casting
Julia Chantrey Amber D'Alessio
Jack Newman History Teacher
John Stoneham Jr. Stunt Coordinator
Robin D. Cook Casting
Louise Rosner-Meyer Unit Production Manager, Co-Producer
Randy K. Singer Foley Mixer
Robin Harlan Foley Artist
Angelique Lewis Stunts
Rajiv Surendra Kevin Gnapoor
Taryn Ash Stunts
Dan Willmott Mr. George
Willard Overstreet Foley Editor
Bathsheba Garnett German Teacher
Anne Couk Assistant Sound Editor
Mike Szakmeister Supervising Dialogue Editor
Nick South Music Editor
Jamie Sparer Roberts Casting Associate
Wendy Greene Bricmont Editor
Alison Reid Stunts
Bryan J. Thomas Stunts
Stefanie Drummond Bethany Byrd
Chris Anton Huge Guy
Michael Carella "B" Camera Operator
Erin Jarvis Skater Girl
Marc Fishman Sound Re-Recording Mixer
Christina Cattle Costumer
Danis Goulet Casting Associate
Luis Sequeira Assistant Costume Designer
Elana Shilling Spelling Girl
Jo Chim Salesperson
Sarah Monat Foley Artist
James Powers Production Manager
Olympia Lukis Jessica Lopez
Jill Messick Executive Producer
Patricia Cuccia Set Decoration
Vic Rigler Property Master
Julie Feiner ADR Editor