Lacey Chabert Gretchen Wieners
Amanda Seyfried Karen Smith
Rachel McAdams Regina George
Lorne Michaels Producer
Lizzy Caplan Janis Ian
Lindsay Lohan Cady Heron
Alison Reid Stunts
Jill Morrison Crying Girl
Amy Poehler Mrs. George
Mary Nelson Negative Cutter
Tina Fey Screenplay, Ms. Norbury
Tim Meadows Mr. Duvall
Neil Flynn Cady's Dad
Ana Gasteyer Cady's Mom
Diego Klattenhoff Shane Oman
Jonathan Malen Kristen's Boyfriend
Cary White Production Design
Anne Couk Assistant Sound Editor
Susan Shopmaker Casting
Taryn Ash Stunts
Mary Jane Fort Costume Design
Sarah Campbell Second Assistant Director
Miranda Edwards Michigan Girl
Jonathan Bennett Aaron Samuels
Eve Crawford English Teacher
Michael Carella "B" Camera Operator
James Powers Production Manager
Karen Pidgurski Unit Publicist
Laura de Carteret Mrs. Wedell
Bathsheba Garnett German Teacher
Angelo Colavecchia Steadicam Operator, Camera Operator
Nick South Music Editor
David Reale Glenn Coco (uncredited)
Mark Waters Director
Robert Doyle Assistant Editor
Dan Willmott Mr. George
Louise Rosner-Meyer Co-Producer, Unit Production Manager
Ely Henry Homeschooled Boy
Robin Harlan Foley Artist
Mike Szakmeister Supervising Dialogue Editor
Andy Jekabsons First Assistant "B" Camera
Bruce Hunter Mathlete Moderator
Patricia Cuccia Set Decoration
Robin D. Cook Casting
Susan Kurtz Dialogue Editor
Sarah Monat Foley Artist
Daniel Franzese Damian
Donna Dupere Extras Casting
Julia Chantrey Amber D'Alessio
Willard Overstreet Foley Editor
Olympia Lukis Jessica Lopez
Wai Choy Mathlete Tim Pak
John Stoneham Jr. Stunt Coordinator
Chuck Michael Supervising Sound Editor
Stefanie Drummond Bethany Byrd
Frank Smathers Dialogue Editor
Daniel DeSanto Jason
Erin Norah Thompson Dawn Schweitzer
Wendy Greene Bricmont Editor
Mike Stanwick Color Timer
Kristen Bone Short Girl
Adam Bocknek Production Assistant
Jeremy Pitts Foley Editor
Vic Rigler Property Master
Bryan J. Thomas Stunts
Bob Baron ADR Mixer
Amanda Scheer-Demme Music Supervisor
Sharron Matthews Joan the Secretary
Daryn Okada Director of Photography
Dwayne Hill Coach Carr
Richard 'Rico' Emerson First Company Grip
Randy K. Singer Foley Mixer