Robert Graysmith
Jake Gyllenhaal
David Toschi
Mark Ruffalo
Mel Nicolai
Zach Grenier
Patrolman (uncredited)
Bud Davis
Sherwood Morrill
Philip Baker Hall
George Bawart
James Le Gros
Ken Narlow
Donal Logue
Zodiac 1 / Zodiac 2
Richmond Arquette
Zodiac 3
Bob Stephenson
Zodiac 4
John Lacy
Al Hyman
Ed Setrakian
Templeton Peck
John Getz
Charles Thieriot
John Terry
William Armstrong
Anthony Edwards
Carol Fisher
Candy Clark
Mrs. Toschi
June Diane Raphael
Darlene Ferrin
Ciara Hughes
Young Mike Mageau
Lee Norris
Bryan Hartnell
Patrick Scott Lewis
Cecilia Shepard
Pell James
Father
David Lee Smith
Lab Tech Dagitz
Jason Wiles
Cabbie / Paul Stine
Charles Schneider
Shorty
James Carraway
Paul Avery
Robert Downey Jr.
Jim Dunbar
Tom Verica
Mike Mageau
Jimmi Simpson
Belli's Housekeeper
Doan Ly
Woman
Karina Logue
Inspector Kracke
Joel Bissonnette
Riverside Captain
John Mahon
John Allen
Matt Winston
Catherine Allen
Jules Bruff
Terry Pascoe
John Ennis
Police Commissioner
J. Patrick McCormack
Melanie
Chloë Sevigny
Duffy Jennings
Adam Goldberg
Linda del Buono
Clea DuVall
Sandy Panzarella
Paul Schulze
Detective #1
Adam Trese
Mulanax's Secretary
Penny Wallace
Donald Cheney
John Hemphill
Man on Marquee
Michel Francoeur
Copy Editor #1
Thomas Kopache
Copy Editor #3
Barry Livingston
Copy Editor #4
Christopher John Fields
Jack Mulanax
Elias Koteas
Young David Graysmith
Jack Samson
David Graysmith
Micah Sauers
Aaron Graysmith
Zachary Sauers
Margot Graysmith
Jessica Baltutis
Patrolman Fouke
Peter Quartaroli
Patrolman Zelms
Geoff Callan
Truck Driver
Michael Hungerford
Society Woman
Anna Katarina
Informant (Hall of Justice A)
E.P. McKnight
Informant
Betty Murphy
Arthur Leigh Allen
John Carroll Lynch
Jeff Daniel Phillips
Shane Woodson
Informant #8
Cookie Crawford
Uniform Cop
Cassius M. Willis
Florence Douglas
Judith Drake
Prison Guard
Phoebe Holston
Pinole Foreman
Marty Lodge
Internal Affairs Agent #1
Cooper Thornton
Internal Affairs Agent #2
Cazimir Milostan
Kathleen Johns' baby
Charlotte Ferguson
Melvin Belli
Brian Cox
Phoebe Ferguson
Kacey Malmsten
Karly Malmsten
Director
JD Cullum
Staff Editor
Stanley B. Herman
Distraught African American Male
Roy Lee Jones
Navy Project Leader
Michael Rose
DOD Project Leader
James Joseph O'Neil
FBI Codebreaker
Rod Damer
Donald Harden
John Sarno
Martin Lee
Dermot Mulroney
Bettye Harden
Gloria Grant
Detective Roy
Brett Rickaby
Detective #2
M.F. Bernier
Newscaster #2
Carter Evans
TV News Anchor
Bill Seward
Newscaster #4
Dave Nemeth
Anchorman #1
Ted Garcia
Interviewer #1
Greg Wolf
Reporter
Barry LeBrock
Kathleen Johns (uncredited)
Ione Skye
Bob Vaughn
Charles Fleischer
Vallejo Desk Ofiicer (uncredited)
David Winston Barge
Hardware Store Customer (uncredited)
Hayati Akbas
Camera Man (uncredited)
Brad Carr
Reporter (uncredited)
Mitchell Fink
Traveler (uncredited)
Erica Ford
Informant (uncredited)
Tish Hicks
Prisoner (uncredited)
Danielle McKee
Office Worker (uncredited)
Derris Nile
Janie (uncredited)
Carmen Plumb
Child Witness (uncredited)
Callie Thompson
Casting
Laray Mayfield
Producer
Bradley J. Fischer
Script Supervisor
Kristine Kelly
David Fincher
Supervising Sound Editor
Ren Klyce
Sound Designer
Ceán Chaffin
Sound Re-Recording Mixer
Michael Semanick
Stunt Coordinator
Mickey Giacomazzi
James Vanderbilt
Screenplay
Unit Production Manager
Daniel M. Stillman
Book
David Parker
Sound Effects Editor
Addison Teague
Richard Hymns
Music Supervisor
George Drakoulias
Production Design
Donald Graham Burt
Editor
Angus Wall
Director of Photography
Harris Savides
Original Music Composer
David Shire
Arnold Messer
Mike Medavoy
Executive Producer
Louis Phillips
Makeup Department Head
Felicity Bowring
Hairstylist
Miia Kovero
Costume Design
Casey Storm
Rigging Gaffer
John R. Manocchia
Randall Poster
Key Hair Stylist
Trish Almeida
Makeup Artist
Amy Schmiederer
Costume Supervisor
Stacy Horn
Art Direction
Keith P. Cunningham
David C. Hughes
Set Decoration
Victor J. Zolfo
Music Editor
Bryan Lawson
Sound mixer
Drew Kunin
Still Photographer
Merrick Morton
Jonathon Stevens
Martin Erskine
Hair Department Head
Kelvin R. Trahan
Second Assistant Director
Sally Sue Beisel
First Assistant Director
Mary Ellen Woods
Dialogue Editor
Malcolm Fife
Richard Quinn