Leonardo DiCaprio John Edgar Hoover
Clint Eastwood Director, Producer, Original Music Composer
Dermot Mulroney Colonel Schwarzkopf
Kaitlyn Dever Palmer's Daughter
Naomi Watts Helen Gandy
Adam Driver Walter Lyle
Jeffrey Donovan Robert Kennedy
Ed Westwick Agent Smith
Emily Alyn Lind Shirley Temple
Lea Thompson Lela Rogers
Jessica Hecht Emma Goldman
Amanda Schull Anita Colby
Denis O'Hare Albert Osborne
Damon Herriman Bruno Hauptmann
Josh Lucas Charles Lindbergh
Johnny Cicco Young Agent
Stephen Root Arthur Koehler
Jack Donner Edgar's Father
Michael O'Neill Senator McKellar
Ryan McPartlin Lawrence Richey
Judi Dench Anna Marie Hoover
Ken Howard Harlan Fiske Stone
Gary Werntz Attorney General
Buddy Van Horn Stunt Coordinator
Armie Hammer Clyde Tolson
Jack Axelrod Caminetti
Christian Clemenson Inspector Schell
Josh Hamilton Robert Irwin
Matthew R. Anderson Stunts
Geoff Stults Raymond Caffrey
Zach Grenier John Condon
Geoff Pierson Mitchell Palmer
Josh Stamberg Agent Stokes
Brian Grazer Producer
Robert Lorenz Producer
Sadie Calvano Edgar's Niece
Jacob Chambers Stunts
Kyle Eastwood Stork Club Band
Kelly Lester Head Secretary
Greg Berry Art Direction
David A. Cooper Franklin Roosevelt
David Clennon Senator Friendly
Miles Fisher Agent Garrison
Dustin Lance Black Writer
Deborah Hopper Costume Design
Richard Nixon Self (archive footage) (uncredited)
Lea Coco Agent Sisk
Brian Avery Stunts
Steve Monroe Restaurant Host
Erica Huggins Executive Producer
Elizabeth Karr Secretary (uncredited)
Gary Fettis Set Decoration
Aaron Lazar Prosecutor Wilentz
David M. Bernstein First Assistant Director
Billy Smith Secret Service Officer
Leslie Augustine Lindbergh Nanny (uncredited)
Gerald Downey FBI Agent
Gary D. Roach Editor
Martin Luther King Jr. Self (archive footage) (uncredited)
Duncan Jarman Makeup Artist, Prosthetic Makeup Artist
Fiona Weir Casting
Gunner Wright Dwight Eisenhower
Joel Cox Editor
Tom Stern Director of Photography
Roberta Bassin Roosevelt's Secretary
Chuck Waters Stunts
Kevin Murray Assistant Sound Editor
Patrick M. Sullivan Jr. Art Direction
Gregg Rudloff Sound Re-Recording Mixer
James J. Murakami Production Design
Michael James Faradie Bureau Agent (1919)
Cheryl Lawson Palmer's Wife