Ron Perlman Red Cap (voice) (uncredited)
Seth Rogen Hogsqueal (voice)
Mary-Louise Parker Helen Grace
Andrew McCarthy Richard Grace
Freddie Highmore Jared Grace / Simon Grace
Nick Nolte Mulgarath
David Strathairn Arthur Spiderwick
Martin Short Thimbletack (voice)
Lyssa J. Caster Production Accountant
Sarah Bolger Mallory Grace
Christopher T. Welch Supervising ADR Editor, Supervising Dialogue Editor
Tyler Patrick Jones Additional Performer
Michèle St-Arnaud Location Manager
Takashi Seida Still Photographer
Hélène Lamarre Art Department Coordinator
James Horner Original Music Composer
Marie-Elaine Bailly Production Coordinator
Joan Plowright Aunt Lucinda Spiderwick
Tom C. Peitzman Co-Producer
Andy Nelson Sound Re-Recording Mixer
Gilbert Larose Jr. Stunts
Martine Giguère-Kazemirchuk Set Decoration
Mark Waters Director
Bob E. Krattiger Gaffer
Karey Kirkpatrick Producer, Screenplay
Phil Tippett Animation Supervisor
Peter J. Silbermann Unit Publicist
Joey Box Stunt Coordinator
Brian Kalin O'Connell Character Designer
James D. Bissell Production Design
John Sayles Screenplay
Michael Kahn Editor
Caleb Deschanel Director of Photography
Sarah Broshar Assistant Editor
Michael Lantieri Special Effects Supervisor
Joanna Johnston Costume Design
Piero Mura Sound Effects Editor
Kevin Yagher Makeup Effects
Mariah Inger Nurse
Anna Behlmer Sound Re-Recording Mixer
Mark Binder Special Sound Effects
Jim Passon Color Timer
Adrien Morot Special Effects Makeup Artist
Josette Perrotta Co-Producer, Unit Production Manager
David McKeown Stunt Coordinator
Robin D. Cook Local Casting
Ellen Goldsmith-Vein Producer
Sherry Hitch Digital Compositor
Mark Canton Producer
Jim Henrikson Music Editor
Julie Feiner Dialogue Editor
David Berenbaum Screenplay
Avram D. Gold Dialogue Editor
Ralph Osborn Dialogue Editor
Fred Berger Production Assistant
Mark Mangini Sound Designer
Patrick Crane First Assistant Editor
Shawn Kelly Animation
Dick Bernstein Music Editor
Val Kuklowsky Dialogue Editor
Steve Rawlins Lead Animator
Martin Allan Kloner Visual Effects Editor
Tod Fennell Helen's Co-Worker
Kimi Webber Script Supervisor
Réjean Goderre Key Hair Stylist
Robert Stecko Camera Operator
Mark Coffey Assistant Sound Editor
Jordy Benattar Young Lucinda Spiderwick
Isabelle Guay Supervising Art Director
Louis Craig Special Effects Supervisor
Ben Rosenblatt Post Production Supervisor
Pablo Helman Visual Effects Supervisor