Trailer
Images
 | Jake Gyllenhaal as Robert Graysmith |
 | Robert Downey Jr. as Paul Avery |
 | Mark Ruffalo as Dave Toschi |
 | Anthony Edwards as Bill Armstrong |
 | Brian Cox as Melvin Belli |
 | Elias Koteas as Jack Mulanax |
 | Chloë Sevigny as Melanie |
 | John Carroll Lynch as Arthur Leigh Allen |
 | Ed Setrakian as Al Hyman |
 | John Getz as Templeton Peck |
 | John Terry as Charles Thieriot |
 | Candy Clark as Carol Fisher |
 | Dermot Mulroney as Captain Martin Lee |
 | Brett Rickaby as Detective Roy |
 | Clea DuVall as Linda del Buono |
 | Donal Logue as Captain Ken Narlow |
 | June Diane Raphael as Mrs. Toschi |
 | Jimmi Simpson as Mike Mageau |
 | Charles Fleischer as Bob Vaughn |
 | Philip Baker Hall as Sherwood Morrill |
 | Adam Goldberg as Duffy Jennings |
 | Zach Grenier as Mel Nicolai |
 | John Lacy as Zodiac 4 |
 | Bob Stephenson as Zodiac 3 |
 | Richmond Arquette as Zodiac 1 y 2 |
 | Michel Francoeur as Man on Marquee |
 | Stanley B. Herman as Staff Editor |
 | Ione Skye |
| Ione Skye as Kathleen Johns |
| Writing | |
| James Vanderbilt | Screenplay |
Production | |
| Mike Medavoy | Producer |
| Arnold Messer | Producer |
| Brad Fischer | Producer |
| James Vanderbilt | Producer |
| Ceán Chaffin | Producer |
Camera | |
| Harris Savides | Director of Photography |
Art | |
| Donald Graham Burt | Production Design |
Editing | |
| Angus Wall | Editor |
Directing | |
| David Fincher | Director |
Sound | |
| David Shire | Original Music Composer |
Writing | |
| Robert Graysmith | Book |
Production | |
| Louis Phillips | Executive Producer |
Costume & Make-Up | |
| Miia Kovero | Hairstylist |
| Kelvin R. Trahan | Hair Department Head |
| Felicity Bowring | Makeup Department Head |
| Casey Storm | Costume Design |
| Trish Almeida | Key Hair Stylist |
| Amy Schmiederer | Makeup Artist |
Sound | |
| George Drakoulias | Music Supervisor |
| Randall Poster | Music Supervisor |
| Martin Erskine | Music Editor |
| Bryan Lawson | Music Editor |
| Jonathon Stevens | Music Editor |
Art | |
| Victor J. Zolfo | Set Decoration |
| Keith P. Cunningham | Art Direction |
Production | |
| Laray Mayfield | Casting |
Directing | |
| Kristine Kelly | Script Supervisor |
Sound | |
| Drew Kunin | Sound mixer |
Camera | |
| Merrick Morton | Still Photographer |
Lighting | |
| John R. Manocchia | Rigging Gaffer |
Sound | |
| Michael Semanick | Sound Re-Recording Mixer |
| David Parker | Sound Re-Recording Mixer |
| Ren Klyce | Supervising Sound Editor |
| Ren Klyce | Sound Designer |
| Richard Hymns | Supervising Sound Editor |
| Addison Teague | Sound Effects Editor |
| David C. Hughes | Sound Effects Editor |
Editing | |
| Malcolm Fife | Dialogue Editor |
| Richard Quinn | Dialogue Editor |
Production | |
| Daniel M. Stillman | Unit Production Manager |
Crew | |
| Mickey Giacomazzi | Stunt Coordinator |
Costume & Make-Up | |
| Stacy Horn | Costume Supervisor |
