Bryan Cranston
Dalton Trumbo
Diane Lane
Cleo Trumbo
Helen Mirren
Hedda Hopper
Elle Fanning
Nikola Trumbo
Louis C.K.
Arlen Hird
John Goodman
Frank King
Michael Stuhlbarg
Edward G. Robinson
David James Elliott
John Wayne
Roger Bart
Buddy Ross
Mark Harelik
Ed Muhl
John Getz
Sam Wood
Alan Tudyk
Ian McLellan Hunter
James DuMont
J. Parnell Thomas
Richard Portnow
Louis B. Mayer
Adewale Akinnuoye-Agbaje
Virgil Brooks
Stephen Root
Hymie King
Dean O'Gorman
Kirk Douglas
Garrett Hines
Andrew Hird
Christian Berkel
Otto Preminger
Dan Bakkedahl
Roy Brewer
Toby Nichols
Chris Trumbo (age 6-10) (as Tobias McDowell Nichols)
Dalton Trumbo
Himself (archive footage)
Laura Flannery
Party Goer
Madison Wolfe
Niki Trumbo (age 8-11)
Johnny Sneed
Robert Stripling
Rio Hackford
Reporter
Dane Rhodes
Reporter
Peter MacKenzie
Robert Kenny
John Neisler
Jury Foreman
Sean Bridgers
Jeff Krandall
Meghan Wolfe
Mitzi Trumbo (age 6-8)
Mark Harelik
Edward 'Ed' Muhl
Suzanne LaChasse
Showgirl (uncredited)
Rhonda Laizer
Trumbo Friend (uncredited)
Eddie Albert
Irving Radovich in Roman Holiday (archive footage) (uncredited)
Lauren Bacall
Self (archive footage) (uncredited)
Lucille Ball
Self (archive footage) (voice) (uncredited)
James Garner
Self (archive footage) (uncredited)
Cary Grant
Self (archive footage) (uncredited)
Audrey Hepburn
Princess Ann (archive footage) (uncredited)
Danny Kaye
Self (archive footage) (uncredited)
Deborah Kerr
Self (archive footage) (uncredited)
Laurence Olivier
Crassus (archive footage) (uncredited)
Gregory Peck
Joe Bradley (archive footage) (uncredited)
Ronald Reagan
Self (archive footage) (uncredited)
Jean Simmons
Varinia (archive footage) (uncredited)
Robert Taylor
Self (archive footage) (uncredited)
