Dalton Trumbo

Bryan Cranston

Ian McLellan Hunter

Alan Tudyk

Hedda Hopper

Helen Mirren

Cleo Trumbo

Diane Lane

Nikola Trumbo

Elle Fanning

Arlen Hird

Louis C.K.

Frank King

John Goodman

Arlen Hird

Louis C. K.

Hymie King

Stephen Root

Edward G. Robinson

Michael Stuhlbarg

Louis B. Mayer

Richard Portnow

John Wayne

David James Elliott

Buddy Ross

Roger Bart

Virgil Brooks

Adewale Akinnuoye-Agbaje

Sam Wood

John Getz

Ed Muhl / Edward 'Ed' Muhl

Mark Harelik

Rocco

Dave Maldonado

Otto Preminger

Christian Berkel

Young Nikola Trumbo

Madison Wolfe

J. Parnell Thomas

James DuMont

Roy Brewer

Dan Bakkedahl

Kirk Douglas

Dean O'Gorman

Chris Trumbo (Age 13-17)

Mattie Liptak

Andrew Hird

Garrett Hines

Party Goer

Laura Flannery

John Wayne

Tobias McDowell Nichols

Chris Trumbo (age 6-10) (as Tobias McDowell Nichols)

Toby Nichols

Robert Stripling

Johnny Sneed

Reporter

Rio Hackford

Reporter

Dane Rhodes

Robert Kenny

Peter Mackenzie

Robert Stripling

John Neisler

Jeff Krandall

Sean Bridgers

Prison Guard

P.J. Marshall

Mitzi Trumbo

Meghan Wolfe

Chris Trumbo

Mitchell Zakocs

Mitzi Trumbo (age 9-12)

Becca Nicole Preston

Mover

Jason Kirkpatrick

Next Door Neighbor

Wayne Pere

Messenger

A.J. Allegra

Niki's Friend

Christian LeBlanc

Journalist

Ron Fassler

TV Interviewer

Jim Gleason

President John F. Kennedy

Rick Kelly

DC Reporter

Billy Slaughter

Master of Ceremonies

Griff Furst

Chris Trumbo (Age 29)

John Mark Skinner

Young Father

Jason Bayle

Prison Guard

J.D. Evermore