| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alan Baumgarten | Crew | Editing | Editor |
 Cindy Carr | Crew | Art | Set Decoration |
Daniel Orlandi | Crew | Costume & Make-Up | Costume Designer |
David Rubin | Crew | Production | Casting |
George Parra | Crew | Directing | First Assistant Director |
 Janice Williams | Crew | Production | Producer |
 Jay Roach | Crew | Directing | Director, Producer |
Jim Denault | Crew | Camera | Director of Photography |
 John McNamara | Crew | Writing | Screenplay, Producer |
Mark Ricker | Crew | Art | Production Design |
 Michael London | Crew | Production | Producer |
Monica Levinson | Crew | Production | Producer, Unit Production Manager |
 Theodore Shapiro | Crew | Sound | Original Music Composer |
Jeri Habberstad | Crew | Crew | Stunt Double |
Jesse Rosenthal | Crew | Art | Art Direction |
Michelle Graham | Crew | Production | Co-Producer |
Bruce Cook | Crew | Writing | Book |
Kevin Kelly Brown | Crew | Production | Producer |
Nimitt Mankad | Crew | Production | Producer |
 Shivani Rawat | Crew | Production | Producer |
Kelly Mullen | Crew | Production | Executive Producer |
Scott August | Crew | Directing | Second Assistant Director |
Laurie Lieser | Crew | Production | Associate Producer |
Heather Arthur | Crew | Crew | Stunt Coordinator |
Lisa Marinaccio | Crew | Art | Art Direction |
 Gary Archer | Crew | Costume & Make-Up | Prosthetics |
 Adewale Akinnuoye-Agbaje | Cast | Actor | Virgil Brooks |
 Alan Tudyk | Cast | Actor | Ian McLellan Hunter |
 Bryan Cranston | Cast | Actor | Dalton Trumbo |
 Christian Berkel | Cast | Actor | Otto Preminger |
 Dalton Trumbo | Cast | Actor | Himself (archive footage) |
 David James Elliott | Cast | Actor | John Wayne |
 Dean O'Gorman | Cast | Actor | Kirk Douglas |
 Diane Lane | Cast | Actress | Cleo Trumbo |
 Ethel Rosenberg | Cast | Actress | Self (archive footage) (uncredited) |
 Helen Mirren | Cast | Actress | Hedda Hopper |
 James DuMont | Cast | Actor | J. Parnell Thomas |
Jesse Lasky Jr. | Cast | Actor | Self (archive footage) (uncredited) |
 John Getz | Cast | Actor | Sam Wood |
 John Goodman | Cast | Actor | Frank King |
 Johnny Sneed | Cast | Actor | Robert Stripling |
 Joseph McCarthy | Cast | Actor | Self (archive footage) (uncredited) |
 Julius Rosenberg | Cast | Actor | Self (archive footage) (uncredited) |
 Louis C.K. | Cast | Actor | Arlen Hird |
 Mark Harelik | Cast | Actor | Edward 'Ed' Muhl |
 Michael Stuhlbarg | Cast | Actor | Edward G. Robinson |
 Peter MacKenzie | Cast | Actor | Robert Kenny |
 Richard Portnow | Cast | Actor | Louis B. Mayer |
 Rio Hackford | Cast | Actor | Reporter |
 Roger Bart | Cast | Actor | Buddy Ross |
 Sean Bridgers | Cast | Actor | Jeff Krandall |
 Stephen Root | Cast | Actor | Hymie King |
 Dan Bakkedahl | Cast | Actor | Roy Brewer |
 Dane Rhodes | Cast | Actor | Reporter |
 Elle Fanning | Cast | Actress | Nikola Trumbo |
 John Neisler | Cast | Actor | Jury Foreman |
 Garrett Hines | Cast | Actor | Andrew Hird |
 Toby Nichols | Cast | Actor | Chris Trumbo (age 6-10) (as Tobias McDowell Nichols) |
 Madison Wolfe | Cast | Actress | Niki Trumbo (age 8-11) |
Mattie Liptak | Cast | Chris Trumbo (Age 13-17) | |
 Rhonda Laizer | Cast | Actress | Trumbo Friend (uncredited) |
 Suzanne LaChasse | Cast | Actress | Showgirl (uncredited) |
Jaclyn Bethany | Cast | Starlet (uncredited) | |
Anne Speed | Cast | Juror (uncredited) | |
Kate Kuen | Cast | Ethel (uncredited) | |
 Laura Flannery | Cast | Actress | Party Goer |
Veronica Parks | Cast | Actress | Showgirl (uncredited) |
 Meghan Wolfe | Cast | Actress | Mitzi Trumbo (age 6-8) |
| Person | Type | Job | Role(s) |
