Bryan Cranston
Dalton Trumbo
Adewale Akinnuoye-Agbaje
Virgil Brooks
Louis C.K.
Arlen Hird
David James Elliott
John Wayne
Elle Fanning
Niki Trumbo
John Goodman
Frank King
Diane Lane
Cleo Trumbo
Michael Stuhlbarg
Edward G. Robinson
Alan Tudyk
Ian McLellan Hunter
Helen Mirren
Hedda Hopper
Dan Bakkedahl
Roy Brewer
Roger Bart
Buddy Ross
Christian Berkel
Otto Preminger
Peter MacKenzie
Robert Kenny
Dean O'Gorman
Kirk Douglas
Richard Portnow
Louis B. Mayer
Stephen Root
Hymie King
Dave Maldonado
Rocco
John Getz
Sam Wood
Laura Flannery
Party Goer
Toby Nichols
Chris Trumbo (age 6-10)
Joseph Martino
Rally Participant
Madison Wolfe
Niki Trumbo (age 8-11)
Jason Bayle
Young Father
James DuMont
J. Parnell Thomas
Johnny Sneed
Robert Stripling
Rio Hackford
Reporter
Dane Rhodes
Reporter
John Neisler
Jury Foreman
Sean Bridgers
Jeff Krandall
J.D. Evermore
Prison Guard
PJ Marshall
Prison Guard
Meghan Wolfe
Mitzi Trumbo (age 6-8)
Mitchell Zakocs
Chris Trumbo (age 10-12)
Jason Kirkpatrick
Mover
Wayne Péré
Next Door Neighbor
A.J. Allegra
Messenger
Mattie Liptak
Chris Trumbo (age 13-17)
Becca Nicole Preston
Mitzi Trumbo (age 9-12)
Garrett Hines
Andrew Hird
Mark Harelik
Ed Muhl
Chris LeBlanc
Niki's Friend
Ron Fassler
Journalist
Jim Gleason
TV Interviewer
Rick Kelly
John F. Kennedy
Billy Slaughter
DC Reporter
Griff Furst
Master of Ceremonies
John Mark Skinner
Chris Trumbo (age 29)
Jaclyn Bethany
Starlet (uncredited)
Kate Kuen
Ethel (uncredited)
Suzanne LaChasse
Showgirl (uncredited)
Rhonda Laizer
Trumbo Friend (uncredited)
Veronica Parks
Showgirl (uncredited)
Anne Speed
Juror (uncredited)