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

John Getz

Sam Wood

Laura Flannery

Party Goer

Toby Nichols

Chris Trumbo (age 6-10)

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)

Jason Kirkpatrick

Mover

Wayne Péré

Next Door Neighbor

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

Suzanne LaChasse

Showgirl (uncredited)

Rhonda Laizer

Trumbo Friend (uncredited)