Cast (in credits order)
| Bradley J. Fischer | ... | Self (as Brad Fischer) | |
| James Vanderbilt | ... | Self | |
| David Fincher | ... | Self | |
| Harris Savides | ... | Self | |
 |
Casey Storm | ... | Self |
| Lee Norris | ... | Self | |
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Ciara Moriarty | ... | Self (as Ciara Hughes) |
|
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Victor J. Zolfo | ... | Self |
| Jake Gyllenhaal | ... | Self | |
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Hope M. Parrish | ... | Self |
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Robert Graysmith | ... | Self - Author 'Zodiac' |
| Robert Downey Jr. | ... | Self | |
| Brian Cox | ... | Self | |
| Mark Ruffalo | ... | Self | |
| Anthony Edwards | ... | Self | |
| David Toschi | ... | Self | |
| Armond Pelissetti | ... | Self | |
| John Carroll Lynch | ... | Self | |
| Richmond Arquette | ... | Self | |
| Patrick Scott Lewis | ... | Self | |
| Pell James | ... | Self | |
| Clea DuVall | ... | Self | |
| Elias Koteas | ... | Self | |
Produced by
| Keith Clark | ... | producer |
| Bjørn T. Myrholt | ... | producer |
| David Prior | ... | executive producer |
Music by
| Buddy Judge | ||
| David Shire | ||
Cinematography by
| Brian Hoodenpyle | ||
Editing by
| Bjørn T. Myrholt | ||
Thanks
| Eric Barba | ... | special thanks |
| Craig Barron | ... | special thanks |
| Lisa Beroud | ... | special thanks |
| Ceán Chaffin | ... | special thanks |
| David Fincher | ... | special thanks |
| Bradley J. Fischer | ... | special thanks |
| Margot Graysmith | ... | special thanks |
| Melanie Graysmith | ... | special thanks |
| Robert Graysmith | ... | special thanks |
| Will Lemmon | ... | special thanks |
| Judd H. Maslansky | ... | special thanks (as Judd Maslansky) |
| Peter Mavromates | ... | special thanks |
| Edward McGurn | ... | special thanks (as Edward J. McGurn) |
| Mike Medavoy | ... | special thanks |
| Ken Rogerson | ... | special thanks |
| Al Shier | ... | special thanks |
| Casey Storm | ... | special thanks |
| James Vanderbilt | ... | special thanks |
| Angus Wall | ... | special thanks |
