Amanda Seyfried Karen Smith
Lacey Chabert Gretchen Wieners
Rachel McAdams Regina George
Lindsay Lohan Cady Heron
Lizzy Caplan Janis Ian
Tina Fey Screenplay, Ms. Norbury
Miranda Edwards Michigan Girl
Amy Poehler Mrs. George
Ana Gasteyer Cady's Mom
Neil Flynn Cady's Dad
Diego Klattenhoff Shane Oman
Taryn Ash Stunts
Jonathan Malen Kristen's Boyfriend
Laura de Carteret Mrs. Wedell
Cary White Production Design
Sarah Monat Foley Artist
Lorne Michaels Producer
Bathsheba Garnett German Teacher
Tim Meadows Mr. Duvall
Randy K. Singer Foley Mixer
Sarah Campbell Second Assistant Director
Patricia Cuccia Set Decoration
Jill Morrison Crying Girl
Jonathan Bennett Aaron Samuels
Eve Crawford English Teacher
Susan Shopmaker Casting
Michael Carella "B" Camera Operator
Amanda Scheer-Demme Music Supervisor
Dane Clark Casting Assistant
David Reale Glenn Coco (uncredited)
James Powers Production Manager
Louise Rosner-Meyer Co-Producer, Unit Production Manager
Dan Willmott Mr. George
Alison Reid Stunts
Chuck Michael Supervising Sound Editor
Nick South Music Editor
Robin D. Cook Casting
Adam Bocknek Production Assistant
Bryan Hirota Visual Effects Supervisor
Kym Kristalie Stunts
Mark Waters Director
John Stoneham Jr. Stunt Coordinator
Vic Rigler Property Master
Ely Henry Homeschooled Boy
Karen Pidgurski Unit Publicist
Buck Damon Music Supervisor
Jo-Ann MacNeil Makeup Artist
Joel Hay Third Assistant Director
Robin Harlan Foley Artist
Michael Gibson Still Photographer
Marie-Claude Harnois Production Coordinator
Mary Nelson Negative Cutter
Mike Szakmeister Supervising Dialogue Editor
Andy Jekabsons First Assistant "B" Camera
Mike Stanwick Color Timer
Marc Fishman Sound Re-Recording Mixer
Bruce Hunter Mathlete Moderator
Susan Kurtz Dialogue Editor
Frank Smathers Dialogue Editor
Daniel Franzese Damian
Julie Feiner ADR Editor
Carol Hartwick Hairstylist
Luis Sequeira Assistant Costume Designer
Jim Harrison Music Editor
Patrick Cyccone Jr. Sound Re-Recording Mixer
Angelo Colavecchia Steadicam Operator, Camera Operator
Jill Messick Executive Producer
Jamie Sparer Roberts Casting Associate
Bob Baron ADR Mixer
Mario Cacioppo Makeup Artist
Willard Overstreet Foley Editor
Julia Chantrey Amber D'Alessio