Trailer
 | Bryan Cranston as Dalton Trumbo |
 | Adewale Akinnuoye-Agbaje as Virgil Brooks |
 | Louis C.K. as Arlen Hird |
 | David James Elliott as John Wayne |
 | Elle Fanning as Niki Trumbo |
 | John Goodman as Frank King |
 | Diane Lane as Cleo Trumbo |
 | Michael Stuhlbarg as Edward G. Robinson |
 | Alan Tudyk as Ian McLellan Hunter |
 | Helen Mirren as Hedda Hopper |
 | Dan Bakkedahl as Roy Brewer |
 | Roger Bart as Buddy Ross |
 | Christian Berkel as Otto Preminger |
 | Peter MacKenzie as Robert Kenny |
 | Dean O'Gorman as Kirk Douglas |
 | Richard Portnow as Louis B. Mayer |
 | Stephen Root as Hymie King |
 | Dave Maldonado as Rocco |
 | John Getz as Sam Wood |
 | Laura Flannery as Party Goer |
 | Toby Nichols as Chris Trumbo (age 6-10) |
| Joseph Martino as Rally Participant |
 | Madison Wolfe as Niki Trumbo (age 8-11) |
 | Jason Bayle as Young Father |
 | James DuMont as J. Parnell Thomas |
 | Johnny Sneed as Robert Stripling |
 | Rio Hackford as Reporter |
 | Dane Rhodes as Reporter |
 | John Neisler as Jury Foreman |
 | Sean Bridgers as Jeff Krandall |
 | J.D. Evermore as Prison Guard |
 | PJ Marshall as Prison Guard |
 | Meghan Wolfe as Mitzi Trumbo (age 6-8) |
| Mitchell Zakocs as Chris Trumbo (age 10-12) |
 | Jason Kirkpatrick as Mover |
 | Wayne Péré as Next Door Neighbor |
| A.J. Allegra as Messenger |
| Mattie Liptak as Chris Trumbo (age 13-17) |
| Becca Nicole Preston as Mitzi Trumbo (age 9-12) |
 | Garrett Hines as Andrew Hird |
 | Mark Harelik as Ed Muhl |
 | Chris LeBlanc as Niki's Friend |
 | Ron Fassler as Journalist |
 | Jim Gleason as TV Interviewer |
 | Rick Kelly as John F. Kennedy |
 | Billy Slaughter as DC Reporter |
 | Griff Furst as Master of Ceremonies |
| John Mark Skinner as Chris Trumbo (age 29) |
| Jaclyn Bethany as Starlet (uncredited) |
| Kate Kuen as Ethel (uncredited) |
 | Suzanne LaChasse as Showgirl (uncredited) |
 | Rhonda Laizer as Trumbo Friend (uncredited) |
| Veronica Parks as Showgirl (uncredited) |
| Anne Speed as Juror (uncredited) |
| Production | |
| Monica Levinson | Unit Production Manager |
Directing | |
| George Parra | First Assistant Director |
| Scott August | Second Assistant Director |
Art | |
| Cindy Carr | Set Decoration |
| Lisa Marinaccio | Art Direction |
Production | |
| Laurie Lieser | Associate Producer |
| Jay Roach | Producer |
Costume & Make-Up | |
| Gary Archer | Prosthetics |
Directing | |
| Jay Roach | Director |
Writing | |
| Bruce Cook | Book |
Production | |
| Kevin Kelly Brown | Producer |
| Monica Levinson | Producer |
| Michael London | Producer |
| Nimitt Mankad | Producer |
| John McNamara | Producer |
| Shivani Rawat | Producer |
| Janice Williams | Producer |
| Michelle Graham | Co-Producer |
| Kelly Mullen | Executive Producer |
Sound | |
| Theodore Shapiro | Original Music Composer |
Camera | |
| Jim Denault | Director of Photography |
Editing | |
| Alan Baumgarten | Editor |
Production | |
| David Rubin | Casting |
Art | |
| Mark Ricker | Production Design |
| Jesse Rosenthal | Art Direction |
Crew | |
| Jeri Habberstad | Stunt Double |
| Heather Arthur | Stunt Coordinator |
Camera | |
| Geoffrey Haley | "A" Camera Operator |
| Geoffrey Haley | Steadicam Operator |
Writing | |
| John McNamara | Writer |
Costume & Make-Up | |
| Daniel Orlandi | Costume Design |
